在这里我发现了return和print的区别

def binary_to_hex(binary_value):
    len_text = len(binary_value)

    for i in range(0, len_text, 4):
        #能把二进制分成四组进行打印
        print(binary_value[0 + i:4 + i])
        #只能运行将前4个数分成一组
        return binary_value[0 + i:4 + i]
        


a = binary_to_hex("1000100011001010")


print(a)

如果运行的是“print
”

如果运行"return"

解决

# 存储十六进制和二进制之间的代码
def binary_to_text(binary_text):
    if binary_text == "0000":
        return 0
    elif binary_text == '0001':
        return 1
    elif binary_text == '0010':
        return 2
    elif binary_text == '0011':
        return 3
    elif binary_text == '0100':
        return 4
    elif binary_text == '0101':
        return 5
    elif binary_text == '0110':
        return 6
    elif binary_text == '0111':
        return 7
    elif binary_text == '1000':
        return 8
    elif binary_text == '1001':
        return 9
    elif binary_text == '1010':
        return 'a'
    elif binary_text == '1011':
        return 'b'
    elif binary_text == '1100':
        return 'c'
    elif binary_text == '1101':
        return 'd'
    elif binary_text == '1110':
        return 'e'
    elif binary_text == '1111':
        return 'f'


def binary_to_hex(binary_value):
    len_text = len(binary_value)

    if len_text % 4 == 0:
        for i in range(0, len_text, 4):
         print(binary_to_text(binary_value[0 + i:4 + i]),end=" ")


    else:
        print("This is invalid number.")




def main():
    binary_to_hex("1000100011001010")


main()