for循环故障

Question

我们刚刚在课堂上学习了五分钟的循环，我们已经得到了一个实验室。我正在努力，但仍然没有得到我需要的。我要做的是取一个整数列表，然后只取奇数整数，把它们相加，然后返回它们，如果整数列表是[3,2,4,7,2,4,1,3,2]，那么返回值是14

def f(ls):
    ct=0
    for x in (f(ls)):
        if x%2==1:
            ct+=x
    return(ct)


print(f[2,5,4,6,7,8,2])

错误代码显示

Traceback (most recent call last):
  File "C:/Users/Ian/Documents/Python/Labs/lab8.py", line 10, in <module>
    print(f[2,5,4,6,7,8,2])
TypeError: 'function' object is not subscriptable

Answer 1

只是几个小错误：

def f(ls):
    ct = 0
    for x in ls:
    #       ^     Do not call the method, but just parse through the list  
        if x % 2 == 1:
            ct += x
    return(ct)
    #     ^  ^ parenthesis are not necessary 

print(f([2,5,4,6,7,8,2]))
#      ^               ^    Missing paranthesis

Answer 2

函数调用中缺少括号

print(f([2,5,4,6,7,8,2]))

而不是

print(f[2,5,4,6,7,8,2])