极客教程Python os.utime()方法
Python中os模块的os.utime()方法用于设置指定路径的访问和修改时间。
os.utime() 语法
os.utime(path, times =None，*，[ns，]dir_fd =None，follow_symlinks = True)
os.utime() 参数
path:一个字符串或字节对象，表示有效的文件系统路径。
times(可选):一个2元组，形式为atime, mtime，每个成员是一个整数或float值，分别表示访问时间和修改时间，单位为秒。
ns(可选):一个2元组(atime_ns, mtime_ns)，每个成员是一个整数或float值，分别表示访问时间和修改时间，单位为纳秒。
dir_fd:指向目录的文件描述符。默认值为“None”。
follow_symlinks:一个布尔值，True或False。If True方法将跟随符号链接，否则不跟随。
返回类型:此方法不返回任何值
os.utime() 示例1
使用os.utime()方法
# Python program to explain os.utime() method
# importing os module
import os
# Path
path = '/home / ihritik / Documents / file.txt'
# Print current access and modification time
# of the above specified path
print("Current access time:", os.stat(path).st_atime)
print("Current modification time:", os.stat(path).st_mtime)
# Access time in seconds
atime = 200000000
# Modification time in seconds
mtime = 100000000
# Set the access time and
# modification time for the
# above specified path
# using os.utime() method
tup = (atime, mtime)
os.utime(path, tup)
print("\nAccess and modification time changed\n")
# Print current access and modification time
print("Current access time:", os.stat(path).st_atime)
print("Current modification time:", os.stat(path).st_mtime)
# Either we can specify times
# or specify ns parameter.
# It is an error to specify
# tuples for both times and ns
输出:
Current access time (in seconds): 1568930018.710342
Current modification time (in seconds): 1568930018.610892
Access and modification time changed
Current access time (in seconds): 200000000.0
Current modification time (in seconds): 100000000.0
os.utime() 示例2
如果指定了ns参数，
# Python program to explain os.utime() method
# importing os module
import os
# Path
path = '/home / ihritik / Documents / file.txt'
# Print current access and modification time
# of the above specified path
print("Current access time (in seconds):", os.stat(path).st_atime)
print("Current modification time (in seconds):", os.stat(path).st_mtime)
# Access time in nanoseconds
atime_ns = 20000000012345
# Modification time in nanoseconds
mtime_ns = 10000000012345
# Set the access time and
# modification time in nanoseconds
# for the above specified path
# using os.utime() method
# (ns is keyword only argument)
tup = (atime_ns, mtime_ns)
os.utime(path, ns = tup)
print("\nAccess and modification time changed\n")
# Print current access and modification time
print("Current access time (in seconds):", os.stat(path).st_atime)
print("Current modification time (in seconds):", os.stat(path).st_mtime)
# Either we can specify times
# or specify ns parameter.
# It is an error to specify
# tuples for both times and ns
输出:
Current access time (in seconds): 1568930018.710342
Current modification time (in seconds): 1568930018.610892
Access and modification time changed
Current access time (in seconds): 20000.000012345
Current modification time (in seconds): 10000.000012345
os.utime() 示例3
如果times参数为None且ns参数未指定
# Python program to explain os.utime() method
# importing os module
import os
# Path
path = '/home / ihritik / Documents / file.txt'
# Print current access and modification time
# of the above specified path
print("Current access time (in seconds):", os.stat(path).st_atime)
print("Current modification time (in seconds):", os.stat(path).st_mtime)
# Set the access time and
# modification time in nanoseconds
# for the above specified path
# using os.utime() method
os.utime(path)
print("\nAccess and modification time changed\n")
# Print current access and modification time
print("Current access time (in seconds):", os.stat(path).st_atime)
print("Current modification time (in seconds):", os.stat(path).st_mtime)
# If times is None and ns is unspecified,
# then it will be equivalent to
# specifying ns = (atime_ns, mtime_ns)
# where member atime_ns and mtime_ns
# are current time in nanoseconds
输出:
Current access time (in seconds): 20000.000012345
Current modification time (in seconds): 10000.000012345
Access and modification time changed
Current access time (in seconds): 1568930018.710342
Current modification time (in seconds): 1568930018.610892
参考:https:/ docs.python.org/ library/os.html#os.utime