CODEWITHSUNDEEP
pythoncombinatorics
SHus
SHus

Reputation: 33

python multiple variable if condition

I'm new to programming and would like to ask in Python if I have a m-list of conditions and would like to know if n of these are true in a if statment:

eg: 

if (a == b) or (c == d) or (e == f):

would return 1,2 or all 3 true, but I want to know if only 2 of these are true

eg: 

if ((a == b) and ((c == d) or (e == f))) or (((a == b) or (c == d)) and (e == f)) or (((a == b) or (e == f)) and (c == d)):

is there any easier way to do this? What to do if (m,n) is large?

Thanks

Upvotes: 3

Views: 312

Answers (4)

Anshul Goyal
Anshul Goyal

Reputation: 76887

If the conditions are equality tests which are guaranteed to return either True or False, then of course you can use @Tim's answer.

Otherwise, you can work out a slight variant using a list of conditions which will work with any conditional statement

conditions = [a == b, 
    c == d,
    e == f,
    e,
    f is None]

And then do a simple sum using:

sum(1 if cond else 0 for cond in conditions) >= m

Note that this approach works if the conditions are boolean in nature as well.

Upvotes: 2

Andriy Ivaneyko
Andriy Ivaneyko

Reputation: 22031

n = 0
for cond in list:
  n += bool(cond)

Upvotes: 0

Jérôme
Jérôme

Reputation: 14674

[a == b, c == d, e == f].count(True)

Upvotes: 6

Tim Pietzcker
Tim Pietzcker

Reputation: 336158

Since True is actually the integer 1, you could do

if (a==b) + (c==d) + (e==f) == 2:

For larger sets of conditions, you could use sum():

conditions = [a==b, c==d, d==e, f==g, ...]
if sum(conditions) == 3:
    # do something

Upvotes: 4

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