Python趣味题

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星号输出图形

菱形

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"""
   *
  ***
 *****
*******
 *****
  ***
   *
"""
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# 方法一：
row = 7
s = '*'
num = [2 * i + 1 if 2 * i + 1 <= row else 2 * (row - i) - 1 for i in range(row)]
for i in num:
    print((s*i).center(row))

# 方法二：
row = 7
s = '*'
for i in range(1, row + 1, 2):
    t = (row - i) // 2
    print(' ' * t + s * i)
for i in reversed(range(1, row - 1, 2)):
    t = (row - i) // 2
    print(' ' * t + s * i)

# 方法三：
row = 7
s = '*'
num = [2 * i + 1 if 2 * i + 1 <= row else 2 * (row - i) - 1 for i in range(row)]
for i in num:
    t = int((row - i) / 2)
    print(' ' * t + s * i)

金字塔形

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"""
   *
  ***
 *****
*******
"""
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row = 4
for i in range(row):
    print((row - 1 - i) * ' ', end='')
    for j in range(2 * i + 1):
        print('*', end='')
    print()

倒三角形

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"""
******* 
 *****
  ***
   *
"""
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row = 4
for i in range(row):
    print(i * ' ', end='')
    for j in range(2 * (row - i) - 1):
        print('*', end='')
    print()

直角三角形

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"""
*
**
***
****
*****
"""
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row = 5
for i in range(row):
    for j in range(i + 1):
        print('*', end='')
    print()

倒直角三角形

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"""
******
*****
****
***
**
*
"""
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row = 6
for i in range(row):
    for j in range(row - i):
        print('*', end='')
    print()

使用map、reduce函数实现数字字符串转成整形

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from functools import reduce


def char2num(s):
    return {'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9}[s]


def str2int(s):
    return reduce(lambda x, y: x * 10 + y, map(char2num, s))


print(str2int('1234'))

求两个数字的最大公约数，最小公倍数

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def max_common(m, n):
    while n:
        m, n = n, m % n
    return m


def min_common(m, n):
    t = m * n
    while n:
        m, n = n, m % n
    return t // m


if __name__ == '__main__':
    a = 36
    b = 5
    print(max_common(a, b))
    print(min_common(a, b))

24点计算

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# -*- coding: utf-8 -*-
# __author__ = "maple"
ops = [
    ('+', lambda x, y: x + y),
    ('-', lambda x, y: x - y),
    ('*', lambda x, y: x * y),
    ('/', lambda x, y: x / y if y != 0 else None)
]


def calc24(numbers):
    for i in range(len(numbers)):
        for j in range(i + 1, len(numbers)):
            rest = numbers[:i] + numbers[i + 1:j] + numbers[j + 1:]
            for op in ops:
                numI = numbers[i] if type(numbers[i]) == int else numbers[i][0]
                numJ = numbers[j] if type(numbers[j]) == int else numbers[j][0]
                exprI = str(numbers[i]) if type(numbers[i]) == int else numbers[i][1]
                exprJ = str(numbers[j]) if type(numbers[j]) == int else numbers[j][1]
                resultNum = op[1](numI, numJ)
                if resultNum is None:
                    continue
                resultExpr = '(' + exprI + op[0] + exprJ + ')'
                if not rest and resultNum == 24:
                    return "Solution found: " + resultExpr
                result = calc24([(resultNum, resultExpr)] + rest)
                if result:
                    return result
    return None


print(calc24([4, 9, 3, 7]))

5位随机验证码

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import random

def code():
    ret = ''
    for i in range(5):
        num = random.randint(0, 9)
        alfa = chr(random.randint(97, 122))
        alfa2 = chr(random.randint(65, 90))
        s = random.choice([str(num), alfa, alfa2])
        ret = ret + s
    return ret

while True:
    a = code()
    print(a)
    s = input('请输入验证码：').strip()
    if s == a:
        print('登录成功')
        break
    else:
        print('输入错误')
        continue