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Example 1-1. Using the os Module to Rename and Remove Files
#Filename: os-example-1.py
import os
import string
def replace(file, search_for, replace_with):
# replace strings in a text file
back = os.path.splitext(file)[0] + ".bak"
temp = os.path.splitext(file)[0] + ".tmp"
try:
# remove old temp file, if any
os.remove(temp)
except os.error:
pass
fi = open(file)
fo = open(temp, "w")
for s in fi.readlines():
fo.write(string.replace(s, search_for, replace_with))
fi.close()
fo.close()
try:
# remove old backup file, if any
os.remove(back)
except os.error:
pass
# rename original to backup...
os.rename(file, back)
# ...and temporary to original
os.rename(temp, file)
# try it out!
file = "samples/sample.txt"
replace(file, "hello", "tjena")
replace(file, "tjena", "hello")
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1.2 Ŀ¼²Ù×÷
1.2.1 listdir()º¯Êý,·µ»ØÖ¸¶¨Ä¿Â¼ÏÂËùÓÐÎļþÃû,²¢±£´æÓÚÒ»ÁбíÖÐ.µ«µ±Ç°Ä¿Â¼±ê¼Ç(.)ºÍ¸¸Ä¿Â¼±ê¼Ç(..)²»ÔÚÆäÖÐ.
Example 1-2. Using the os Module to List the Files in a Directory
File: os-example-2.py
import os
for file in os.listdir("samples"):
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def __init__(self, n = 10):
self._Field = n
def __getitem__(self, range):
return MyClass(self._Field)
obj1 = MyClass()
obj2 = obj1
obj3 = obj1[:]
obj1._Field = 100
obj4 = MyClass(123)
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