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annotate Lib/test/test_pdb.py @ 79675:c0a2294de787 2.7

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Issue #16199: Backport 2to3 typo fix from 3.2.
author Chris Jerdonek <chris.jerdonek@gmail.com>
date Thu, 11 Oct 2012 16:15:46 -0700
parents 2644e4ea02d3
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # A test suite for pdb; at the moment, this only validates skipping of
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2 # specified test modules (RFE #5142).
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3
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4 import imp
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5 import sys
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6 import os
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7 import unittest
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8 import subprocess
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9 import textwrap
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10
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11 from test import test_support
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12 # This little helper class is essential for testing pdb under doctest.
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13 from test_doctest import _FakeInput
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14
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15
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16 class PdbTestCase(unittest.TestCase):
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17
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18 def run_pdb(self, script, commands):
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19 """Run 'script' lines with pdb and the pdb 'commands'."""
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20 filename = 'main.py'
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21 with open(filename, 'w') as f:
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22 f.write(textwrap.dedent(script))
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23 self.addCleanup(test_support.unlink, filename)
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24 cmd = [sys.executable, '-m', 'pdb', filename]
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25 stdout = stderr = None
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26 proc = subprocess.Popen(cmd, stdout=subprocess.PIPE,
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27 stdin=subprocess.PIPE,
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28 stderr=subprocess.STDOUT,
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29 )
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30 stdout, stderr = proc.communicate(commands)
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31 proc.stdout.close()
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32 proc.stdin.close()
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33 return stdout, stderr
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34
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35 def test_issue13183(self):
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36 script = """
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37 from bar import bar
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38
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39 def foo():
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40 bar()
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41
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42 def nope():
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43 pass
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44
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45 def foobar():
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46 foo()
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47 nope()
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48
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49 foobar()
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50 """
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51 commands = """
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52 from bar import bar
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53 break bar
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54 continue
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55 step
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56 step
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57 quit
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58 """
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59 bar = """
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60 def bar():
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61 pass
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62 """
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63 with open('bar.py', 'w') as f:
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64 f.write(textwrap.dedent(bar))
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65 self.addCleanup(test_support.unlink, 'bar.py')
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66 stdout, stderr = self.run_pdb(script, commands)
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67 self.assertTrue(
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68 any('main.py(5)foo()->None' in l for l in stdout.splitlines()),
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69 'Fail to step into the caller after a return')
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70
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71
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72 class PdbTestInput(object):
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73 """Context manager that makes testing Pdb in doctests easier."""
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74
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75 def __init__(self, input):
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76 self.input = input
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77
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78 def __enter__(self):
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79 self.real_stdin = sys.stdin
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80 sys.stdin = _FakeInput(self.input)
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81
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82 def __exit__(self, *exc):
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83 sys.stdin = self.real_stdin
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84
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85
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86 def write(x):
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87 print x
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88
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89 def test_pdb_displayhook():
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90 """This tests the custom displayhook for pdb.
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91
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92 >>> def test_function(foo, bar):
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93 ... import pdb; pdb.Pdb().set_trace()
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94 ... pass
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95
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96 >>> with PdbTestInput([
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97 ... 'foo',
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98 ... 'bar',
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99 ... 'for i in range(5): write(i)',
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100 ... 'continue',
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101 ... ]):
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102 ... test_function(1, None)
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103 > <doctest test.test_pdb.test_pdb_displayhook[0]>(3)test_function()
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104 -> pass
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105 (Pdb) foo
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106 1
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107 (Pdb) bar
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108 (Pdb) for i in range(5): write(i)
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109 0
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110 1
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111 2
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112 3
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113 4
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114 (Pdb) continue
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115 """
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116
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117 def test_pdb_breakpoint_commands():
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118 """Test basic commands related to breakpoints.
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119
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120 >>> def test_function():
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121 ... import pdb; pdb.Pdb().set_trace()
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122 ... print(1)
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123 ... print(2)
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124 ... print(3)
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125 ... print(4)
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126
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127 First, need to clear bdb state that might be left over from previous tests.
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128 Otherwise, the new breakpoints might get assigned different numbers.
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129
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130 >>> from bdb import Breakpoint
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131 >>> Breakpoint.next = 1
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132 >>> Breakpoint.bplist = {}
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133 >>> Breakpoint.bpbynumber = [None]
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134
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135 Now test the breakpoint commands. NORMALIZE_WHITESPACE is needed because
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136 the breakpoint list outputs a tab for the "stop only" and "ignore next"
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137 lines, which we don't want to put in here.
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138
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139 >>> with PdbTestInput([ # doctest: +NORMALIZE_WHITESPACE
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140 ... 'break 3',
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141 ... 'disable 1',
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142 ... 'ignore 1 10',
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143 ... 'condition 1 1 < 2',
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144 ... 'break 4',
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145 ... 'break 4',
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146 ... 'break',
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147 ... 'clear 3',
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148 ... 'break',
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149 ... 'condition 1',
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150 ... 'enable 1',
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151 ... 'clear 1',
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152 ... 'commands 2',
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153 ... 'print 42',
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154 ... 'end',
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155 ... 'continue', # will stop at breakpoint 2 (line 4)
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156 ... 'clear', # clear all!
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157 ... 'y',
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158 ... 'tbreak 5',
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159 ... 'continue', # will stop at temporary breakpoint
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160 ... 'break', # make sure breakpoint is gone
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161 ... 'continue',
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162 ... ]):
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163 ... test_function()
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164 > <doctest test.test_pdb.test_pdb_breakpoint_commands[0]>(3)test_function()
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165 -> print(1)
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166 (Pdb) break 3
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167 Breakpoint 1 at <doctest test.test_pdb.test_pdb_breakpoint_commands[0]>:3
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168 (Pdb) disable 1
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169 (Pdb) ignore 1 10
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170 Will ignore next 10 crossings of breakpoint 1.
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171 (Pdb) condition 1 1 < 2
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172 (Pdb) break 4
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173 Breakpoint 2 at <doctest test.test_pdb.test_pdb_breakpoint_commands[0]>:4
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174 (Pdb) break 4
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175 Breakpoint 3 at <doctest test.test_pdb.test_pdb_breakpoint_commands[0]>:4
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176 (Pdb) break
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177 Num Type Disp Enb Where
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178 1 breakpoint keep no at <doctest test.test_pdb.test_pdb_breakpoint_commands[0]>:3
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179 stop only if 1 < 2
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180 ignore next 10 hits
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181 2 breakpoint keep yes at <doctest test.test_pdb.test_pdb_breakpoint_commands[0]>:4
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182 3 breakpoint keep yes at <doctest test.test_pdb.test_pdb_breakpoint_commands[0]>:4
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183 (Pdb) clear 3
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184 Deleted breakpoint 3
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185 (Pdb) break
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186 Num Type Disp Enb Where
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187 1 breakpoint keep no at <doctest test.test_pdb.test_pdb_breakpoint_commands[0]>:3
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188 stop only if 1 < 2
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189 ignore next 10 hits
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190 2 breakpoint keep yes at <doctest test.test_pdb.test_pdb_breakpoint_commands[0]>:4
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191 (Pdb) condition 1
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192 Breakpoint 1 is now unconditional.
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193 (Pdb) enable 1
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194 (Pdb) clear 1
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195 Deleted breakpoint 1
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196 (Pdb) commands 2
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197 (com) print 42
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198 (com) end
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199 (Pdb) continue
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200 1
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201 42
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202 > <doctest test.test_pdb.test_pdb_breakpoint_commands[0]>(4)test_function()
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203 -> print(2)
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204 (Pdb) clear
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205 Clear all breaks? y
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206 (Pdb) tbreak 5
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207 Breakpoint 4 at <doctest test.test_pdb.test_pdb_breakpoint_commands[0]>:5
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208 (Pdb) continue
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209 2
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210 Deleted breakpoint 4
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211 > <doctest test.test_pdb.test_pdb_breakpoint_commands[0]>(5)test_function()
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212 -> print(3)
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213 (Pdb) break
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214 (Pdb) continue
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215 3
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216 4
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217 """
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218
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219
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220 def test_pdb_skip_modules():
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221 """This illustrates the simple case of module skipping.
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222
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223 >>> def skip_module():
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224 ... import string
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225 ... import pdb; pdb.Pdb(skip=['string*']).set_trace()
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226 ... string.lower('FOO')
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227
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228 >>> with PdbTestInput([
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229 ... 'step',
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230 ... 'continue',
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231 ... ]):
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232 ... skip_module()
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233 > <doctest test.test_pdb.test_pdb_skip_modules[0]>(4)skip_module()
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234 -> string.lower('FOO')
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235 (Pdb) step
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236 --Return--
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237 > <doctest test.test_pdb.test_pdb_skip_modules[0]>(4)skip_module()->None
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238 -> string.lower('FOO')
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239 (Pdb) continue
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240 """
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241
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242
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243 # Module for testing skipping of module that makes a callback
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244 mod = imp.new_module('module_to_skip')
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245 exec 'def foo_pony(callback): x = 1; callback(); return None' in mod.__dict__
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246
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247
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248 def test_pdb_skip_modules_with_callback():
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249 """This illustrates skipping of modules that call into other code.
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250
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251 >>> def skip_module():
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252 ... def callback():
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253 ... return None
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254 ... import pdb; pdb.Pdb(skip=['module_to_skip*']).set_trace()
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255 ... mod.foo_pony(callback)
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256
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257 >>> with PdbTestInput([
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258 ... 'step',
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259 ... 'step',
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260 ... 'step',
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261 ... 'step',
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262 ... 'step',
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263 ... 'continue',
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264 ... ]):
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265 ... skip_module()
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266 ... pass # provides something to "step" to
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267 > <doctest test.test_pdb.test_pdb_skip_modules_with_callback[0]>(5)skip_module()
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268 -> mod.foo_pony(callback)
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269 (Pdb) step
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270 --Call--
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271 > <doctest test.test_pdb.test_pdb_skip_modules_with_callback[0]>(2)callback()
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272 -> def callback():
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273 (Pdb) step
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274 > <doctest test.test_pdb.test_pdb_skip_modules_with_callback[0]>(3)callback()
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275 -> return None
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276 (Pdb) step
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277 --Return--
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278 > <doctest test.test_pdb.test_pdb_skip_modules_with_callback[0]>(3)callback()->None
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279 -> return None
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280 (Pdb) step
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281 --Return--
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282 > <doctest test.test_pdb.test_pdb_skip_modules_with_callback[0]>(5)skip_module()->None
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283 -> mod.foo_pony(callback)
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284 (Pdb) step
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285 > <doctest test.test_pdb.test_pdb_skip_modules_with_callback[1]>(10)<module>()
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286 -> pass # provides something to "step" to
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287 (Pdb) continue
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288 """
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289
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290
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291 def test_pdb_continue_in_bottomframe():
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292 """Test that "continue" and "next" work properly in bottom frame (issue #5294).
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293
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294 >>> def test_function():
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295 ... import pdb, sys; inst = pdb.Pdb()
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296 ... inst.set_trace()
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297 ... inst.botframe = sys._getframe() # hackery to get the right botframe
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298 ... print(1)
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299 ... print(2)
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300 ... print(3)
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301 ... print(4)
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302
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303 First, need to clear bdb state that might be left over from previous tests.
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304 Otherwise, the new breakpoints might get assigned different numbers.
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305
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306 >>> from bdb import Breakpoint
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307 >>> Breakpoint.next = 1
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308 >>> Breakpoint.bplist = {}
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309 >>> Breakpoint.bpbynumber = [None]
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310
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311 >>> with PdbTestInput([
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312 ... 'next',
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313 ... 'break 7',
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314 ... 'continue',
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315 ... 'next',
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316 ... 'continue',
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317 ... 'continue',
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318 ... ]):
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319 ... test_function()
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320 > <doctest test.test_pdb.test_pdb_continue_in_bottomframe[0]>(4)test_function()
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321 -> inst.botframe = sys._getframe() # hackery to get the right botframe
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322 (Pdb) next
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323 > <doctest test.test_pdb.test_pdb_continue_in_bottomframe[0]>(5)test_function()
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324 -> print(1)
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325 (Pdb) break 7
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326 Breakpoint 1 at <doctest test.test_pdb.test_pdb_continue_in_bottomframe[0]>:7
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327 (Pdb) continue
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328 1
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329 2
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330 > <doctest test.test_pdb.test_pdb_continue_in_bottomframe[0]>(7)test_function()
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331 -> print(3)
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332 (Pdb) next
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333 3
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334 > <doctest test.test_pdb.test_pdb_continue_in_bottomframe[0]>(8)test_function()
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335 -> print(4)
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336 (Pdb) continue
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337 4
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338 """
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339
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340 class ModuleInitTester(unittest.TestCase):
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341
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342 def test_filename_correct(self):
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343 """
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344 In issue 7750, it was found that if the filename has a sequence that
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345 resolves to an escape character in a Python string (such as \t), it
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346 will be treated as the escaped character.
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347 """
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348 # the test_fn must contain something like \t
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349 # on Windows, this will create 'test_mod.py' in the current directory.
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350 # on Unix, this will create '.\test_mod.py' in the current directory.
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351 test_fn = '.\\test_mod.py'
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352 code = 'print("testing pdb")'
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353 with open(test_fn, 'w') as f:
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354 f.write(code)
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355 self.addCleanup(os.remove, test_fn)
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356 cmd = [sys.executable, '-m', 'pdb', test_fn,]
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357 proc = subprocess.Popen(cmd,
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358 stdout=subprocess.PIPE,
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359 stdin=subprocess.PIPE,
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360 stderr=subprocess.STDOUT,
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361 )
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362 stdout, stderr = proc.communicate('quit\n')
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363 self.assertIn(code, stdout, "pdb munged the filename")
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364
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365
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366 def test_main():
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367 from test import test_pdb
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368 test_support.run_doctest(test_pdb, verbosity=True)
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369 test_support.run_unittest(
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370 PdbTestCase,
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371 ModuleInitTester)
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372
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373 if __name__ == '__main__':
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374 test_main()