I am using Python and I would like to have an if statement with many variables in it.
Such as:
if A, B, C, and D >= 2:
print (A, B, C, and D)
I realize that this is not the correct syntax and that is exactly the question I am asking — what is the correct Python syntax for this type of an if statement?
You want to test a condition for all the variables:
if all(x >= 2 for x in (A, B, C, D)):
print(A, B, C, D)
This should be helpful if you're testing a long list of variables with the same condition.
If you needed to check:
if A, B, C, or D >= 2:
Then you want to test a condition for any of the variables:
if any(x >= 2 for x in (A, B, C, D)):
print(A, B, C, D)
Another idea:
if min(A, B, C, D) >= 2:
print A, B, C, D
min means: find the minimum of all the numbers between the parenthesis. If even the minimum is greater or equal than 2, we can conclude that all of the variables are greater or equal than 2
min(...) won't shortcircuit whereas all(...) does
I'd probably write this as
v = A, B, C, D
if all(i >= 2 for i in v):
print v
If you have ten variables that you are treating as a group like this, you probably want to make them elements of a list, or values in a dictionary, or attributes of an object. For example:
my_dict = {'A': 1, 'B': 2, 'C': 3 }
if all(x > 2 for x in my_dict.values()):
print "They're all more than two!"
How about:
if A >= 2 and B >= 2 and C >= 2 and D >= 2:
print A, B, C, D
For the general case, there isn't a shorter way for indicating that the same condition must be true for all variables - unless you're willing to put the variables in a list, for that take a look at some of the other answers.
Depending on what you are trying to accomplish, passing a list to a function may work.
def foo(lst):
for i in lst:
if i < 2:
return
print lst
Except that she's probably asking for this:
if A >= 2 and B >= 2 and C >= 2 and D >= 2:
