I am a beginner of python, thank you so much!
function:
def count(c):
return c.count(1)
count(1,1,1,11,1,12,1)
This function doesn't work, I want to create a function count how many 1’s?
lambda:
counts = lambda m:count('m')
counts('what is you name, my name is mammy!')
This lambda doesn't work, too. I want to create a lambda count how many 'm''s?
Just add a * in front of c to make it take all the leftover arguments and sets it to a list
def count(*c):
return c.count(1)
count(1,1,1,11,1,12,1)
and the lambda function can be:
counts = lambda m: m.count('m')
counts('what is you name, my name is mammy!')
Your first example fails because you're passing multiple arguments, and it only accepts one (presumably a list). One way to fix it would be to pass a list:
def count(c):
return c.count(1)
print(count([1,1,1,11,1,12,1])) # 5
Another way to fix it is to allow multiple parameters but treat them as a list. Here's how you can do that:
def count(*c):
return c.count(1)
print(count(1,1,1,11,1,12,1)) # 5
Your second example is missing a thing to call count on. Again, one possible fix:
counts = lambda x: x.count('m')
print(counts('what is you name, my name is mammy!')) # 6
