问题
I have two lists:
mylist = ['total','age','gender','region','sex']
checklist = ['total','civic']
I have to work with some code I have inherited which looks like this:
for item in mylist:
if item in checklist:
do something:
How can I work with the code above to tell me that 'civic' is not in mylist?.
This would've been the ideal way to do it but I cant use it, don't ask me why.
for item in checklist:
if item not in mylist:
print item
Outcome:
civic
回答1:
How about this?
for item in mylist:
if item in checklist:
pass
else:
# do something
print item
回答2:
Your code should work, but you can also try:
if not item in mylist :
回答3:
if I got it right, you can try
for item in [x for x in checklist if x not in mylist]:
print (item)
回答4:
You better do this syntax
if not (item in mylist):
Code inside the if
来源：https://stackoverflow.com/questions/22833893/python-if-not-in-list