Python:从另一个文件打印字符串

Question

我想调用一个文件，删除其数据，写入新行并打印它。 下面是我的程序及其输出。

from sys import argv
string, filename = argv
text = open(filename, 'w+')
text.truncate()
line1 = "hey"
line2 = "I was doing just fine before I met you"
line3 = "I drink too much and that's an issue but I'm okay"
text.write('%s\n%s\n%s\n' %(line1, line2, line3))
new = text.read()
old = text.readlines()
print "%s" %(new)
print old
print text.readlines()
text.close()

输出:

[] []

Answer 1

所以，你的错误(根据你的评论，它不允许你阅读)。

这是因为您尝试使用文件指针进行读取，该文件指针用于以写入模式打开文件。

from sys import argv
string, filename = argv
with open(filename, 'w') as text:
    line1 = "hey"
    line2 = "I was doing just fine before I met you"
    line3 = "I drink too much and that's an issue but I'm okay"
    text.write('%s\n%s\n%s\n' %(line1, line2, line3))

with open(filename, 'r') as text:
    ...