Python ValueError：long() 的无效文字，基数为 10：''
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ValueError: invalid literal for long() with base 10: ''
提问by cerber
How do I get this to work?
我如何让这个工作？
n = 1234
f = open("file", "r")
while True:
x=f.readline()
print "*********************"
print n%(long(x))
if n%(long(x))==0:
print x
else:
print "..."
I'm a noob in python and I'm getting an error I don't understand. What am I doing wrong?
我是 python 的菜鸟，遇到了一个我不明白的错误。我究竟做错了什么？
ValueError: invalid literal for long() with base 10: ''
回答by unutbu
In [104]: long('')
ValueError: invalid literal for long() with base 10: ''
This error is telling you that xis the empty string.
此错误告诉您这x是空字符串。
You could be getting this at the end of the file. It can be fixed with:
你可能会在文件的末尾得到这个。它可以通过以下方式修复：
while True:
x = f.readline()
if x == '': break
回答by John La Rooy
A try/exceptblock can be a handy way to debug things like this
一个try/except块可以调试这样的事情的简便方法
n = 1234
f = open("file", "r")
while True:
x=f.readline()
print "*********************"
try: # Add these 3 lines
print n%(long(x))
except ValueError: # to help work out
print "Something went wrong {!r}".format(x) # the problem value
if n%(long(x))==0:
print x
else:
print "..."
