Question :
So I am writing some code in python 3.1.5 that requires there be more than one condition for something to happen. Example:
def example(arg1, arg2, arg3):
if arg1 == 1:
if arg2 == 2:
if arg3 == 3:
print("Example Text")
The problem is that when I do this it doesn’t print anything if arg2 and arg3 are equal to anything but 0. Help?
Answer #1:
I would use
def example(arg1, arg2, arg3):
if arg1 == 1 and arg2 == 2 and arg3 == 3:
print("Example Text")
The and operator is identical to the logic gate with the same name; it will return 1 if and only if all of the inputs are 1. You can also use or operator if you want that logic gate.
EDIT: Actually, the code provided in your post works fine with me. I don’t see any problems with that. I think that this might be a problem with your Python, not the actual language.
Answer #2:
Darian Moody has a nice solution to this challenge in his blog post:
a = 1
b = 2
c = True
rules = [a == 1,
b == 2,
c == True]
if all(rules):
print("Success!")
The all() method returns True when all elements in the given iterable are true. If not, it returns False.
You can read a little more about it in the python docs here and more information and examples here.
(I also answered the similar question with this info here – How to have multiple conditions for one if statement in python)
Answer #3:
Assuming you’re passing in strings rather than integers, try casting the arguments to integers:
def example(arg1, arg2, arg3):
if int(arg1) == 1 and int(arg2) == 2 and int(arg3) == 3:
print("Example Text")
(Edited to emphasize I’m not asking for clarification; I was trying to be diplomatic in my answer. ?)
Answer #4:
Might be a bit odd or bad practice but this is one way of going about it.
(arg1, arg2, arg3) = (1, 2, 3)
if (arg1 == 1)*(arg2 == 2)*(arg3 == 3):
print('Example.')
Anything multiplied by 0 == 0. If any of these conditions fail then it evaluates to false.
Answer #5:
I am a little late to the party but I thought I’d share a way of doing it, if you have identical types of conditions, i.e. checking if all, any or at given amount of A_1=A_2 and B_1=B_2, this can be done in the following way:
cond_list_1=["1","2","3"]
cond_list_2=["3","2","1"]
nr_conds=1
if len([True for i, j in zip(cond_list_1, cond_list_2) if i == j])>=nr_conds:
print("At least " + str(nr_conds) + " conditions are fullfilled")
if len([True for i, j in zip(cond_list_1, cond_list_2) if i == j])==len(cond_list_1):
print("All conditions are fullfilled")
This means you can just change in the two initial lists, at least for me this makes it easier.
