在里面 make_list ，你在印刷 names ，然后隐式返回 None . 改变 print 到 return :

def make_list(number):
    names =[]
    for item in range(0,number):
        names.append(input("Enter your name with a capital letter."))
    return names

这样，调用者将把列表分配给 names 而不是 None .

修复方法是返回names数组，而不是在函数中打印名称。

def make_list(number):
      names =[]
      for item in range(0,number):
          names.append(input("Enter your name with a capital letter. "))
      return (names)

number = int(input("How many names need to be entered? "))
names = make_list(number)
for name in names:
    if name[0] == "A":
        print("Name", name, "starts with A")

样本输出：

How many names need to be entered? 2
Enter your name with a capital letter. Andrew
Enter your name with a capital letter. Abby
Name Andrew starts with A
Name Abby starts with A

您需要将函数make_list中的值返回到主代码中的名称

def make_list(number):
  names =[]
  for item in range(0,number):
      names.append(input("Enter your name with a capital letter."))
  print(names)
  return names

number = int(input("How many names need to be entered?"))
names = make_list(number)
for name in names:
    if name[0] == "A":
       print("Name", name, "starts with A")

def make_list(number):
    names =[]
    for item in range(0,number):
        names.append(input("Enter your name with a capital letter. "))
    return (names)

number = int(input("How many names need to be entered? "))
names = make_list(number)
for name in names:
    print(f"Name {name} starts with {name[0]}")

在原始代码中， number=int(input("blah")) ... 在函数内部 make_list() 所以 make_list() 从未接到过电话。此外，您需要 return names 在…的结尾 make_list() ，否则它将隐式返回 None 的返回值 print() .