Python 显示整数的素数因子的程序

我试图制作一个程序，将数字作为输入，并以列表格式显示该程序：

# we ask for input
num = int(input('enter the number of which you would like to find prime factors of\n='))
div_list = []  # we create an empty list to store all the divisors of the number
prime_div = []  # we create a list for all the prime divisors
for _ in range(2, num-1):  # we check all the divisors
    if num % _ == 0:
        div_list.append(_)  # we add all the divisors to the list
for i in range(len(div_list)):  # this loop will run the next loop for the duration of all the nums
    for j in range(2, div_list[i]):
        if div_list[i] % j == 0:
            pass
        else:
            prime_div.append(div_list[i])


print('the list of all the prime factors is')
print(prime_div)

但当我运行这个程序时，它只给我一个数字的输入：

enter the number of which you would like to find prime factors of
=49
the list of all the prime factors is
[7, 7, 7, 7, 7]

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我不明白为什么会这样。有什么想法吗？

我认为这将解决您的问题（您在代码中使用了额外的缩进。我已在程序中注释掉）：

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注意：请尽量避免在python中使用

\uuu

作为变量或占位符。

建议：尽量不要使用“\uu”作为变量。ok将在我的mind@RamPandey

\u

通常在迭代中用作占位符，但实际值不会被使用，而只是需要循环构造（无可否认，这种情况有点罕见，但也不太罕见）当你开始使用<代码> < <代码>的值时，考虑将它重命名为更具信息性的东西，如@ ToHiguliSaleSuggest.是的，但是你能解释一下我的代码有什么问题吗？你的代码可以更优化。我没有添加复杂的代码来让你更容易。我想我可以优化它的时间复杂度。但在这种情况下，您的代码会更大。虽然您是初学者，所以我避免了这一部分。@user1055395是的，我知道，但我想让这段代码尽可能简单。

num = int(input('enter the number of which you would like to find prime factors of\n='))
div_list = []  # we create an empty list to store all the divisors of the number
prime_div = []  # we create a list for all the prime divisors
for _ in range(2, num-1):  # we check all the divisors
    if num % _ == 0:
        div_list.append(_)  # we add all the divisors to the list

for i in range(len(div_list)):  # this loop will run the next loop for the duration of all the nums
    for j in range(2, div_list[i]):
        if div_list[i] % j == 0:
            pass
    else: #This line will execute if div_list[i] is a prime number. You were executing else clause again and again
        prime_div.append(div_list[i]) #removed extra indentation, this was causing your error


print('the list of all the prime factors is')
print(prime_div)