Mercurial > cpython-lru_cache-weakref

annotate Tools/parser/test_unparse.py @ 81343:3a7cd8efc19f

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#16852: merge with 3.3.
author Ezio Melotti <ezio.melotti@gmail.com>
date Thu, 10 Jan 2013 03:29:45 +0200
parents 0e5a698d3c4c
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 import unittest
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2 import test.support
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3 import io
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4 import os
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5 import random
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6 import tokenize
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7 import unparse
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8 import ast
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9
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10 def read_pyfile(filename):
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11 """Read and return the contents of a Python source file (as a
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12 string), taking into account the file encoding."""
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13 with open(filename, "rb") as pyfile:
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14 encoding = tokenize.detect_encoding(pyfile.readline)[0]
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15 with open(filename, "r", encoding=encoding) as pyfile:
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16 source = pyfile.read()
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17 return source
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18
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19 for_else = """\
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20 def f():
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21 for x in range(10):
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22 break
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23 else:
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24 y = 2
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25 z = 3
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26 """
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27
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28 while_else = """\
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29 def g():
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30 while True:
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31 break
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32 else:
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33 y = 2
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34 z = 3
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35 """
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36
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37 relative_import = """\
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38 from . import fred
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39 from .. import barney
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40 from .australia import shrimp as prawns
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41 """
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42
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43 nonlocal_ex = """\
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44 def f():
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45 x = 1
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46 def g():
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47 nonlocal x
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48 x = 2
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49 y = 7
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50 def h():
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51 nonlocal x, y
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52 """
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53
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54 # also acts as test for 'except ... as ...'
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55 raise_from = """\
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56 try:
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57 1 / 0
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58 except ZeroDivisionError as e:
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59 raise ArithmeticError from e
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60 """
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61
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62 class_decorator = """\
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63 @f1(arg)
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64 @f2
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65 class Foo: pass
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66 """
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67
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68 elif1 = """\
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69 if cond1:
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70 suite1
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71 elif cond2:
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72 suite2
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73 else:
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74 suite3
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75 """
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76
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77 elif2 = """\
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78 if cond1:
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79 suite1
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80 elif cond2:
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81 suite2
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82 """
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83
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84 try_except_finally = """\
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85 try:
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86 suite1
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87 except ex1:
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88 suite2
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89 except ex2:
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90 suite3
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91 else:
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92 suite4
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93 finally:
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94 suite5
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95 """
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96
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97 with_simple = """\
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98 with f():
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99 suite1
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100 """
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101
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102 with_as = """\
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103 with f() as x:
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104 suite1
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105 """
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106
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107 with_two_items = """\
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108 with f() as x, g() as y:
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109 suite1
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110 """
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111
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112 class ASTTestCase(unittest.TestCase):
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113 def assertASTEqual(self, ast1, ast2):
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114 self.assertEqual(ast.dump(ast1), ast.dump(ast2))
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115
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116 def check_roundtrip(self, code1, filename="internal"):
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117 ast1 = compile(code1, filename, "exec", ast.PyCF_ONLY_AST)
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118 unparse_buffer = io.StringIO()
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119 unparse.Unparser(ast1, unparse_buffer)
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120 code2 = unparse_buffer.getvalue()
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121 ast2 = compile(code2, filename, "exec", ast.PyCF_ONLY_AST)
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122 self.assertASTEqual(ast1, ast2)
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123
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124 class UnparseTestCase(ASTTestCase):
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125 # Tests for specific bugs found in earlier versions of unparse
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126
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127 def test_del_statement(self):
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128 self.check_roundtrip("del x, y, z")
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129
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130 def test_shifts(self):
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131 self.check_roundtrip("45 << 2")
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132 self.check_roundtrip("13 >> 7")
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133
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134 def test_for_else(self):
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135 self.check_roundtrip(for_else)
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136
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137 def test_while_else(self):
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138 self.check_roundtrip(while_else)
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139
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140 def test_unary_parens(self):
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141 self.check_roundtrip("(-1)**7")
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142 self.check_roundtrip("(-1.)**8")
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143 self.check_roundtrip("(-1j)**6")
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144 self.check_roundtrip("not True or False")
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145 self.check_roundtrip("True or not False")
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146
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147 def test_integer_parens(self):
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148 self.check_roundtrip("3 .__abs__()")
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149
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150 def test_huge_float(self):
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151 self.check_roundtrip("1e1000")
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152 self.check_roundtrip("-1e1000")
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153 self.check_roundtrip("1e1000j")
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154 self.check_roundtrip("-1e1000j")
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155
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156 def test_min_int(self):
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157 self.check_roundtrip(str(-2**31))
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158 self.check_roundtrip(str(-2**63))
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159
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160 def test_imaginary_literals(self):
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161 self.check_roundtrip("7j")
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162 self.check_roundtrip("-7j")
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163 self.check_roundtrip("0j")
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164 self.check_roundtrip("-0j")
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165
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166 def test_lambda_parentheses(self):
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167 self.check_roundtrip("(lambda: int)()")
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168
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169 def test_chained_comparisons(self):
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170 self.check_roundtrip("1 < 4 <= 5")
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171 self.check_roundtrip("a is b is c is not d")
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172
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173 def test_function_arguments(self):
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174 self.check_roundtrip("def f(): pass")
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175 self.check_roundtrip("def f(a): pass")
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176 self.check_roundtrip("def f(b = 2): pass")
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177 self.check_roundtrip("def f(a, b): pass")
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178 self.check_roundtrip("def f(a, b = 2): pass")
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179 self.check_roundtrip("def f(a = 5, b = 2): pass")
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180 self.check_roundtrip("def f(*, a = 1, b = 2): pass")
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181 self.check_roundtrip("def f(*, a = 1, b): pass")
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182 self.check_roundtrip("def f(*, a, b = 2): pass")
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183 self.check_roundtrip("def f(a, b = None, *, c, **kwds): pass")
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184 self.check_roundtrip("def f(a=2, *args, c=5, d, **kwds): pass")
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185 self.check_roundtrip("def f(*args, **kwargs): pass")
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186
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187 def test_relative_import(self):
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188 self.check_roundtrip(relative_import)
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189
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190 def test_nonlocal(self):
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191 self.check_roundtrip(nonlocal_ex)
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192
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193 def test_raise_from(self):
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194 self.check_roundtrip(raise_from)
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195
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196 def test_bytes(self):
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197 self.check_roundtrip("b'123'")
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198
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199 def test_annotations(self):
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200 self.check_roundtrip("def f(a : int): pass")
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201 self.check_roundtrip("def f(a: int = 5): pass")
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202 self.check_roundtrip("def f(*args: [int]): pass")
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203 self.check_roundtrip("def f(**kwargs: dict): pass")
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204 self.check_roundtrip("def f() -> None: pass")
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205
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206 def test_set_literal(self):
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207 self.check_roundtrip("{'a', 'b', 'c'}")
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208
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209 def test_set_comprehension(self):
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210 self.check_roundtrip("{x for x in range(5)}")
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211
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212 def test_dict_comprehension(self):
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213 self.check_roundtrip("{x: x*x for x in range(10)}")
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214
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215 def test_class_decorators(self):
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216 self.check_roundtrip(class_decorator)
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217
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218 def test_class_definition(self):
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219 self.check_roundtrip("class A(metaclass=type, *[], **{}): pass")
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220
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221 def test_elifs(self):
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222 self.check_roundtrip(elif1)
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223 self.check_roundtrip(elif2)
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224
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225 def test_try_except_finally(self):
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226 self.check_roundtrip(try_except_finally)
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227
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228 def test_starred_assignment(self):
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229 self.check_roundtrip("a, *b, c = seq")
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230 self.check_roundtrip("a, (*b, c) = seq")
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231 self.check_roundtrip("a, *b[0], c = seq")
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232 self.check_roundtrip("a, *(b, c) = seq")
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233
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234 def test_with_simple(self):
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235 self.check_roundtrip(with_simple)
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236
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237 def test_with_as(self):
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238 self.check_roundtrip(with_as)
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239
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240 def test_with_two_items(self):
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241 self.check_roundtrip(with_two_items)
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242
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243
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244 class DirectoryTestCase(ASTTestCase):
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245 """Test roundtrip behaviour on all files in Lib and Lib/test."""
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246
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247 # test directories, relative to the root of the distribution
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248 test_directories = 'Lib', os.path.join('Lib', 'test')
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249
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250 def test_files(self):
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251 # get names of files to test
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252 dist_dir = os.path.join(os.path.dirname(__file__), os.pardir, os.pardir)
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253
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254 names = []
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255 for d in self.test_directories:
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256 test_dir = os.path.join(dist_dir, d)
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257 for n in os.listdir(test_dir):
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258 if n.endswith('.py') and not n.startswith('bad'):
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259 names.append(os.path.join(test_dir, n))
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260
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261 # Test limited subset of files unless the 'cpu' resource is specified.
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262 if not test.support.is_resource_enabled("cpu"):
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263 names = random.sample(names, 10)
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264
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265 for filename in names:
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266 if test.support.verbose:
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267 print('Testing %s' % filename)
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268 source = read_pyfile(filename)
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269 self.check_roundtrip(source)
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270
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271
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272 def test_main():
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273 test.support.run_unittest(UnparseTestCase, DirectoryTestCase)
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274
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275 if __name__ == '__main__':
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276 test_main()