Mercurial > cpython-lru_cache-weakref

annotate Lib/calendar.py @ 4566:6403c94de50d legacy-trunk

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Added safeguard against failure in __del__.
author Guido van Rossum <guido@python.org>
date Wed, 27 Nov 1996 19:39:58 +0000
parents 1940892d2fe3
children 5e03ea6927f2
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1 ###############################
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2 # Calendar printing functions #
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3 ###############################
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4
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5 # Revision 2: uses funtions from built-in time module
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6
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7 # Import functions and variables from time module
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8 from time import gmtime, localtime, mktime, asctime, ctime
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9
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10 # Exception raised for bad input (with string parameter for details)
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11 error = 'calendar.error'
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12
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13 # Note when comparing these calendars to the ones printed by cal(1):
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14 # My calendars have Monday as the first day of the week, and Sunday as
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15 # the last! (I believe this is the European convention.)
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16
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17 # Constants for months referenced later
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18 January = 1
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19 February = 2
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20
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21 # Number of days per month (except for February in leap years)
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22 mdays = [0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
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23
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24 # Full and abbreviated names of weekdays
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25 day_name = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', \
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26 'Friday', 'Saturday', 'Sunday']
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27 day_abbr = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
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28
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29 # Full and abbreviated names of months (1-based arrays!!!)
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30 month_name = ['', 'January', 'February', 'March', 'April', \
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31 'May', 'June', 'July', 'August', \
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32 'September', 'October', 'November', 'December']
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33 month_abbr = [' ', 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', \
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34 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
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35
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36 # Return 1 for leap years, 0 for non-leap years
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37 def isleap(year):
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38 return year % 4 == 0 and (year % 100 <> 0 or year % 400 == 0)
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39
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40 # Return number of leap years in range [y1, y2)
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41 # Assume y1 <= y2 and no funny (non-leap century) years
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42 def leapdays(y1, y2):
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43 return (y2+3)/4 - (y1+3)/4
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44
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45 # Return weekday (0-6 ~ Mon-Sun) for year (1970-...), month (1-12), day (1-31)
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46 def weekday(year, month, day):
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47 secs = mktime((year, month, day, 0, 0, 0, 0, 0, 0))
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48 tuple = localtime(secs)
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49 return tuple[6]
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50
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51 # Return weekday (0-6 ~ Mon-Sun) and number of days (28-31) for year, month
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52 def monthrange(year, month):
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53 if not 1 <= month <= 12: raise ValueError, 'bad month number'
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54 day1 = weekday(year, month, 1)
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55 ndays = mdays[month] + (month == February and isleap(year))
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56 return day1, ndays
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57
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58 # Return a matrix representing a month's calendar
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59 # Each row represents a week; days outside this month are zero
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60 def _monthcalendar(year, month):
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61 day1, ndays = monthrange(year, month)
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62 rows = []
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63 r7 = range(7)
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64 day = 1 - day1
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65 while day <= ndays:
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66 row = [0, 0, 0, 0, 0, 0, 0]
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67 for i in r7:
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68 if 1 <= day <= ndays: row[i] = day
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69 day = day + 1
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70 rows.append(row)
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71 return rows
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72
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73 # Caching interface to _monthcalendar
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74 _mc_cache = {}
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75 def monthcalendar(year, month):
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76 key = (year, month)
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77 if _mc_cache.has_key(key):
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78 return _mc_cache[key]
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79 else:
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80 _mc_cache[key] = ret = _monthcalendar(year, month)
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81 return ret
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82
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83 # Center a string in a field
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84 def _center(str, width):
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85 n = width - len(str)
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86 if n <= 0: return str
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87 return ' '*((n+1)/2) + str + ' '*((n)/2)
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88
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89 # XXX The following code knows that print separates items with space!
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90
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91 # Print a single week (no newline)
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92 def prweek(week, width):
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93 for day in week:
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94 if day == 0: s = ''
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95 else: s = `day`
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96 print _center(s, width),
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97
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98 # Return a header for a week
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99 def weekheader(width):
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100 str = ''
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101 if width >= 9: names = day_name
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102 else: names = day_abbr
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103 for i in range(7):
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104 if str: str = str + ' '
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105 str = str + _center(names[i%7][:width], width)
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106 return str
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107
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108 # Print a month's calendar
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109 def prmonth(year, month, w = 0, l = 0):
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110 w = max(2, w)
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111 l = max(1, l)
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112 print _center(month_name[month] + ' ' + `year`, 7*(w+1) - 1),
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113 print '\n'*l,
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114 print weekheader(w),
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115 print '\n'*l,
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116 for week in monthcalendar(year, month):
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117 prweek(week, w)
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118 print '\n'*l,
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119
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120 # Spacing of month columns
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121 _colwidth = 7*3 - 1 # Amount printed by prweek()
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122 _spacing = ' '*4 # Spaces between columns
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123
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124 # 3-column formatting for year calendars
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125 def format3c(a, b, c):
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126 print _center(a, _colwidth),
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127 print _spacing,
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128 print _center(b, _colwidth),
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129 print _spacing,
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130 print _center(c, _colwidth)
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131
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132 # Print a year's calendar
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133 def prcal(year):
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134 header = weekheader(2)
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135 format3c('', `year`, '')
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136 for q in range(January, January+12, 3):
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137 print
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138 format3c(month_name[q], month_name[q+1], month_name[q+2])
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139 format3c(header, header, header)
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140 data = []
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141 height = 0
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142 for month in range(q, q+3):
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143 cal = monthcalendar(year, month)
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144 if len(cal) > height: height = len(cal)
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145 data.append(cal)
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146 for i in range(height):
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147 for cal in data:
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148 if i >= len(cal):
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149 print ' '*_colwidth,
5
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150 else:
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151 prweek(cal[i], 2)
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152 print _spacing,
5
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153 print