获取ftp.retrlines以将文件内容打印为字符串 [英] Get ftp.retrlines to print a file's content to a string

问题描述

我想使用ftplib获取文件的内容，并将其存储在python中的字符串变量中.我的第一次尝试是在下面.我猜lambda不能包含赋值-也许是因为lambda是一个函数+变量，它们应该是自包含的(?).

I want to get the contents of a file with ftplib and store it in a string variable in python. My first attempt is below. I guess lambdas can't contain assignment -- maybe because a lambda is a function + variables that should be self contained (?).

contents = ""
ftp.retrlines("RETR " + filename, lambda s: contents=s) #lambda cannot contain assignment

无论如何，我需要将输出捕获到stdout还是有更简单的方法?

Anyway, do I need to capture output to stdout or is there an easier way?

推荐答案

outStr = StringIO.StringIO() # Use a string like a file.
ftp.retrlines('RETR ' + fileToGet, outStr.write)
print outStr.getvalue()
outStr.close()

https://docs.python.org/2/library/stringio.html

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