在 Python 中将行号添加到输出中

问题描述

例如，如果输入文件是:

For example, if the input file is:

def main():
    for i in range(10):
        print("I love Python")
    print("Good bye!")

那么输出将是:

1   def main():
2       for i in range(10):
3           print("I love Python")
4       print("Good bye!")

我很难在每行中添加行.我的程序是:

I have difficulty in adding lines to each line. My program is:

filename = input("Please enter a file name: ")
count = 0

openfile = open(filename, "r")

for lines in openfile:
    linenumbers = openfile.write(str(count)+'	'+lines)
    count += 1

print(count)

推荐答案

使用 with 语句关闭文件缓冲区，只连接字符串:

Use a with statement to close the file buffer and just concatenate strings:

with open('file.txt', 'r') as program:
    data = program.readlines()

with open('file.txt', 'w') as program:
    for (number, line) in enumerate(data):
        program.write('%d  %s' % (number + 1, line))

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