python 中的变量不是它们在 for 循环中的值

Question

我正在制作一个函数，该函数使用 bin() 函数将整数转换为二进制数，然后删除“0b”，将其添加到输出嵌套列表中，输出应如下所示：

[['0','0','0','0','0','0','0','0'],['0','0','0','0','0','0','0','1'],...] 以8位数字为字符串的列表列表

但是，当添加前导零的 for 循环（见下文）运行时，我得到 128 个前导零。我检查了前导零值，它是正确的。我需要更改什么才能使其输出预期的内容？

谢谢

def convert_to_binary(num_list,func_list):
    ...
    for i in range(len(num_list) - 1):
        leading_zeros = 8 - len(func_list[i])
        #print(leading_zeros)
        for j in range(leading_zeros):
            func_list[j].insert(0,'0')
    print(func_list)

Answer 1

更新

我已经根据评论更新了代码：

'the intended goal of the function was to make it so you gave it a list of integers and another empty list that the function would fill.'

def convert_to_binary(num_list, func_list):
    for i in range(len(num_list)):
        # Collects the binary string removing '0b'
        binary_string = bin(num_list[i])[2:] 

        # Break the string into a char array (for loop shorthand)
        temp = [char for char in binary_string] 

        # Add the binary array to func_list
        func_list.append(temp) 

        # Pad with 0's        
        leading_zeros = 8 - len(temp)
        for j in range(leading_zeros):
            func_list[i].insert(0,'0')
    print(func_list)

if __name__ == '__main__':
    num_list = range(0, 10)
    func_list = []
    convert_to_binary(num_list, func_list)

原创

我不太确定在输入之前 ... 或在 func_list 期间发生了什么，但是我做出了这些假设：

num_list = 整数列表（例如 1 - 10）

func_list = 二进制字符串列表：其中 func_list[i] = bin(num_list[i]) 删除了字符串前面的 0b。

满足上述条件 - 以下将执行您的要求：

def convert_to_binary(num_list, func_list):
    for i in range(len(num_list)):
        leading_zeros = 8 - len(func_list[i])

        # Build an array of the char's in the func_list index
        # can be done in shorthand with temp = [char for char in func_list[i][k]]
        temp = []
        for k in range(len(func_list[i])):
            temp.append(func_list[i][k])

        # Replace the binary string with binary char array at func_list index
        # e.g. '1' becomes ['1']
        func_list[i] = temp

        # Add 0's to the front of the char array 
        for j in range(leading_zeros):
            func_list[i].insert(0,'0')
    print(func_list)

if __name__ == '__main__':
    num_list = range(0, 10)

    # Create an array of Binary strings 
    # (for each value in num_list - removing '0b' from the front)
    func_list = [bin(i)[2:]for i in num_list] 

    convert_to_binary(num_list, func_list)

输出：

[['0', '0', '0', '0', '0', '0', '0', '0'], ['0', '0', '0', '0', '0', '0', '0', '1'], ['0', '0', '0', '0', '0', '0', '1', '0'], ['0', '0', '0', '0', '0', '0', '1', '1'], ['0', '0', '0', '0', '0', '1', '0', '0'], ['0', '0', '0', '0', '0', '1', '0', '1'], ['0', '0', '0', '0', '0', '1', '1', '0'], ['0', '0', '0', '0', '0', '1', '1', '1'], ['0', '0', '0', '0', '1', '0', '0', '0'], ['0', '0', '0', '0', '1', '0', '0', '1']]

python 中的变量不是它们在 for 循环中的值

Variables in python aren't their value inside a for loop

python

binary

function

list

nested-lists