# 十进制转化二进制

"""
知识点：
    1、数据类型转换
    2、赋值运算符，注意：一定要先定义变量
    3、逻辑运算符，or and not
    4、Wile/for循环
    5、算术运算符，整除'//',求余'%'
    6、字符串索引
"""


while True:

    # 提示输入一个整数
    num = float(input('请输入整数：'))

    # 定义变量
    b_inv = ''
    b_order = ''

    j = 1

    # 退出程序
    if num == int(False):   # 等价于num == 0
        print('退出转换！')
        break   # 结束循环

    # 重新输入
    if num < 0 or num > int(num):
        print('请输入正整数！！！')
        continue        # 结束本次循环，开始下次循环

    # 倒序写入
    while not False:    # not False == True

        # 能被2整除写入'0'
        if num % 2 == 0:
            b_inv += '0'

        # 不能被2整除写入'1'
        else:
            b_inv += '1'

        # 跳出循环条件
        if num // 2 == 0:
            break   # 结束循环

        num //= 2   # 整除2
        j += 1      # 循环累加

    # 顺序输出
    for i in range(j):

        # 再倒序写入
        b_order += b_inv[-(i + 1)]

    print('它的二进制是：{}'.format(b_order))

运行结果：

python十进制转二进制，可指定位数

# convert a decimal (denary, base 10) integer to a binary string (base 2)

# tested with Python24 vegaseat 6/1/2005

def Denary2Binary(n):

'''convert denary integer n to binary string bStr'''

bStr = ''

if n < 0: raise ValueError, "must be a positive integer"

if n == 0: return '0'

while n > 0:

bStr = str(n % 2) + bStr

n = n >> 1

return bStr

def int2bin(n, count=24):

"""returns the binary of integer n, using count number of digits"""

return "".join([str((n >> y) & 1) for y in range(count-1, -1, -1)])

# this test runs when used as a standalone program, but not as an imported module

# let's say you save this module as den2bin.py and use it in another program

# when you import den2bin the __name__ namespace would now be den2bin and the

# test would be ignored

if __name__ == '__main__':

print Denary2Binary(255) # 11111111

# convert back to test it

print int(Denary2Binary(255), 2) # 255

print

# this version formats the binary

print int2bin(255, 12) # 000011111111

# test it

print int("000011111111", 2) # 255

print

# check the exceptions

print Denary2Binary(0)

print Denary2Binary(-5) # should give a ValueError

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一、主体思想

使用列表，通过不断对二取余整除，将余数存入列表中来实现进制的转换

二、相关代码

1.引入库

x=int(input("please enter a decimal number:"))
r=0
rs=[]
while(x!=0):
    r=x%2
    x=x//2
    rs=[r]+rs  #将数据放于表头
for i in range(0,len(rs)):
    print(rs[i],end='')