我如何只打印“ for”循环中的最后一个结果

Question

How can I print only the final result of a 'for' loop? For example, here I want the print only the last result (and not all of them):

A=[1,2.5,3,4,5]
a=A[1::2]
b=A[0::2]
c=b[0]

for num in b:
    c=c*num  
    print sum(a),c

Answer 1

you can use the for/else pattern:

a = 1
for i in xrange(1, 10):
    a *= i
else:
    print a

Answer 2

Use a variable:

A=[1,2.5,3,4,5]
a=A[1::2]
b=A[0::2]
c=b[0]

for num in b:
    c=c*num  
    l=sum(a),c
print(l)

Answer 3

as mattias said, just put the print outside the for loop, like this

A=[1,2.5,3,4,5]
a=A[1::2]
b=A[0::2]
c=b[0]

for num in b:
    c=c*num  

print sum(a),c  #notice that is now outside the loop

at the end of the loop c would have it latest calculate value from the for-loop which then you can print it or do whatever you want with it

Answer 4

尝试for i in range(len(b)):使用for i in range(len(b)):然后if i == len(b)-1: execute code而不是for循环。