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linecache, 可以用它方便地获取某一文件某一行的内容。而且它也被 traceback 模块用来获取相关源码信息来展示。
用法很简单:
>>> import linecache
>>> linecache.getline('/etc/passwd', 4)
'sys:x:3:3:sys:/dev:/bin/sh\n'
linecache.getline 第一参数是文件名，第二个参数是行编号。如果文件名不能直接找到的话，会从 sys.path 里找。
如果请求的行数超过文件行数，函数不会报错，而是返回''空字符串。
如果文件不存在，函数也不会报错，也返回''空字符串。
# Python的标准库linecache模块非常适合这个任务
import linecache
the_line = linecache.getline('d:/FreakOut.cpp', 222)
print (the_line)
# linecache读取并缓存文件中所有的文本，
# 若文件很大，而只读一行，则效率低下。
# 可显示使用循环, 注意enumerate从0开始计数，而line_number从1开始
def getline(the_file_path, line_number):
if line_number < 1:
return ''
for cur_line_number, line in enumerate(open(the_file_path, 'rU')):
if
