FilesExpand file tree

master

/

genericpath.py

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

155 lines (124 loc) · 4.86 KB

master

/

genericpath.py

Copy path

Top

File metadata and controls

• Code
• Blame

155 lines (124 loc) · 4.86 KB

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

"""

Path operations common to more than one OS

Do not use directly. The OS specific modules import the appropriate

functions from this module themselves.

"""

import os

import stat

__all__ = ['commonprefix', 'exists', 'getatime', 'getctime', 'getmtime',

'getsize', 'isdir', 'isfile', 'samefile', 'sameopenfile',

'samestat']

# Does a path exist?

# This is false for dangling symbolic links on systems that support them.

def exists(path):

"""Test whether a path exists. Returns False for broken symbolic links"""

try:

os.stat(path)

except (OSError, ValueError):

return False

return True

# This follows symbolic links, so both islink() and isdir() can be true

# for the same path on systems that support symlinks

def isfile(path):

"""Test whether a path is a regular file"""

try:

st = os.stat(path)

except (OSError, ValueError):

return False

return stat.S_ISREG(st.st_mode)

# Is a path a directory?

# This follows symbolic links, so both islink() and isdir()

# can be true for the same path on systems that support symlinks

def isdir(s):

"""Return true if the pathname refers to an existing directory."""

try:

st = os.stat(s)

except (OSError, ValueError):

return False

return stat.S_ISDIR(st.st_mode)

def getsize(filename):

"""Return the size of a file, reported by os.stat()."""

return os.stat(filename).st_size

def getmtime(filename):

"""Return the last modification time of a file, reported by os.stat()."""

return os.stat(filename).st_mtime

def getatime(filename):

"""Return the last access time of a file, reported by os.stat()."""

return os.stat(filename).st_atime

def getctime(filename):

"""Return the metadata change time of a file, reported by os.stat()."""

return os.stat(filename).st_ctime

# Return the longest prefix of all list elements.

def commonprefix(m):

"Given a list of pathnames, returns the longest common leading component"

if not m: return ''

# Some people pass in a list of pathname parts to operate in an OS-agnostic

# fashion; don't try to translate in that case as that's an abuse of the

# API and they are already doing what they need to be OS-agnostic and so

# they most likely won't be using an os.PathLike object in the sublists.

if not isinstance(m[0], (list, tuple)):

m = tuple(map(os.fspath, m))

s1 = min(m)

s2 = max(m)

for i, c in enumerate(s1):

if c != s2[i]:

return s1[:i]

return s1

# Are two stat buffers (obtained from stat, fstat or lstat)

# describing the same file?

def samestat(s1, s2):

"""Test whether two stat buffers reference the same file"""

return (s1.st_ino == s2.st_ino and

s1.st_dev == s2.st_dev)

# Are two filenames really pointing to the same file?

def samefile(f1, f2):

"""Test whether two pathnames reference the same actual file or directory

This is determined by the device number and i-node number and

raises an exception if an os.stat() call on either pathname fails.

"""

s1 = os.stat(f1)

s2 = os.stat(f2)

return samestat(s1, s2)

# Are two open files really referencing the same file?

# (Not necessarily the same file descriptor!)

def sameopenfile(fp1, fp2):

"""Test whether two open file objects reference the same file"""

s1 = os.fstat(fp1)

s2 = os.fstat(fp2)

return samestat(s1, s2)

# Split a path in root and extension.

# The extension is everything starting at the last dot in the last

# pathname component; the root is everything before that.

# It is always true that root + ext == p.

# Generic implementation of splitext, to be parametrized with

# the separators

def _splitext(p, sep, altsep, extsep):

"""Split the extension from a pathname.

Extension is everything from the last dot to the end, ignoring

leading dots. Returns "(root, ext)"; ext may be empty."""

# NOTE: This code must work for text and bytes strings.

sepIndex = p.rfind(sep)

if altsep:

altsepIndex = p.rfind(altsep)

sepIndex = max(sepIndex, altsepIndex)

dotIndex = p.rfind(extsep)

if dotIndex > sepIndex:

# skip all leading dots

filenameIndex = sepIndex + 1

while filenameIndex < dotIndex:

if p[filenameIndex:filenameIndex+1] != extsep:

return p[:dotIndex], p[dotIndex:]

filenameIndex += 1

return p, p[:0]

def _check_arg_types(funcname, *args):

hasstr = hasbytes = False

for s in args:

if isinstance(s, str):

hasstr = True

elif isinstance(s, bytes):

hasbytes = True

else:

raise TypeError(f'{funcname}() argument must be str, bytes, or '

f'os.PathLike object, not {s.__class__.__name__!r}') from None

if hasstr and hasbytes:

raise TypeError("Can't mix strings and bytes in path components") from None