【Python】Learn Python the hard way, ex16 读写文件

本文链接：https://blog.youkuaiyun.com/henryghx/article/details/48979699

本文探讨了在Python中进行文件读写的方法，重点对比了两种不同的操作方式，指出方法2更为实用。通过open函数配合指定参数，可以避免使用truncate()函数来清空文件。

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# coding:utf-8
#方法1
'''
from sys import argv

script, filename = argv

print "We're going to erase %r." % filename
print "If you don't want that, hit CTRL-C(^C)."
print "If you do want that, hit RETURN."

raw_input("?")

print "Opening the file..."
target = open (filename, 'w')

print "Truncating the file. Goodby!"
target.truncate()

print "Now I'm going to ask you for three lines."

line1 = raw_input("line 1: ")
line2 = raw_input("line 2: ")
line3 = raw_input("line 3: ")

print "I'm going to write these to the file."

target.write(line1)
target.write("\n")
target.write(line2)
target.write("\n")
target.write(line3)
target.write("\n")

print "And finally, we close it."
target.close()
'''
#方法2
from sys import argv

script, filename = argv

print "We're going to erase %r." % filename
print "If you don't want that, hit CTRL-C(^C)."
print "If you do want that, hit RETURN."

raw_input("?")

print "Opening the file..."
target = open (filename, 'w')

print "Truncating the file. Goodby!"
target.truncate()

print "Now I'm going to ask you for three lines."

line1 = raw_input("line 1: ")
line2 = raw_input("line 2: ")
line3 = raw_input("line 3: ")

print "I'm going to write these to the file."

target.write(line1 + "\n" + line2 + "\n" + line3 + "\n")

print "And finally, we close it."
target.close()


'''
Test Result:

We're going to erase '/Users/GaoHongxing/Desktop/ex16 sample.txt'.
If you don't want that, hit CTRL-C(^C).
If you do want that, hit RETURN.
?
Opening the file...
Truncating the file. Goodby!
Now I'm going to ask you for three lines.
line 1: Mary had a little lamb
line 2: It's fleece waw white these to the file.
line 3: It was also tasty
I'm going to write these to the file.
And finally, we close it.
'''

心得：

1, 方法2更实用

2, open函数使用了参数，就不再需要truncate()函数（清空文件）