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bianxiaokai
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feat: python init
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‎.vscode/settings.json

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{
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"python.formatting.provider": "yapf",
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"python.linting.flake8Enabled": true,
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"python.linting.flake8Args": ["--max-line-length=248"],
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"python.linting.pylintEnabled": false
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}

‎__pycache__/function.cpython-310.pyc

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‎for.py

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from collections.abc import Iterable
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d = {'a': 1, 'b': 2, 'c': 3}
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for value in d.values():
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print(value)
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for k, v in d.items():
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print('key:', k, 'value:', v)
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isIns = isinstance('abc', Iterable)
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for i, value in enumerate(['A', 'B', 'C']):
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print('i:', i, 'value:', value)
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def findMinAndMax(L):
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if len(L) == 0:
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return (None, None)
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min = L[0]
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max = L[0]
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for num in L:
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if num < min:
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min = num
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if num > max:
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max = num
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return (min, max)
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# 测试
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if findMinAndMax([]) != (None, None):
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print('测试失败!')
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elif findMinAndMax([7]) != (7, 7):
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print('测试失败!')
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elif findMinAndMax([7, 1]) != (1, 7):
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print('测试失败!')
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elif findMinAndMax([7, 1, 3, 9, 5]) != (1, 9):
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print('测试失败!')
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else:
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print('测试成功!')

‎function.py

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import math
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# 内置函数
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abs(-200)
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max(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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# 数据类型转换
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int('123')
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float('123.123')
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str(1.23)
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bool(1)
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bool('')
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a = abs
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x = a(123.45)
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print(x)
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n1 = 255
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n2 = 1000
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print(hex(n1))
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def my_abs(x):
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if not isinstance(x, (int, float)):
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raise TypeError('x must be an integer or float')
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if x >= 0:
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return x
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else:
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return -x
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def nop(age):
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if age >= 18:
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pass
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def move(x, y, step, angle=0):
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nx = x + step * math.cos(angle)
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ny = y + step * math.sin(angle)
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return nx, ny
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r = move(100, 100, 60, math.pi / 6)
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def quadratic(a, b, c):
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if not isinstance(a * b * c, (float, int)):
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raise TypeError("quadratic must be a float or int")
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q = b**2 - 4 * a * c
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if q < 0:
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print('no solution')
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elif q == 0:
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print('此方程的解是唯一的')
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x = (-b) / (2 * a)
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print(x)
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else:
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x1 = ((-b + math.sqrt(q)) / (2 * a))
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x2 = ((-b - math.sqrt(q)) / (2 * a))
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return x1, x2
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def enroll(name, gender, age=6, city='Beijing'):
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pass
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def add_end(L=None):
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if L is None:
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L = []
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L.append('END')
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return L
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# 可变参数
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# 可变参数在函数调用时自动组装为一个tuple
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def calc(*numbers):
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sum = 0
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for n in numbers:
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sum += n**2
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return sum
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nums = [1, 2, 3]
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calc(*nums)
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# 关键字参数
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# 允许你传入0个或任意个含参数名的参数，这些关键字参数在函数内部自动组装为一个dict
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def person(name, age, **kw):
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print('name:', name, 'age:', age, 'other:', kw)
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person('Bob', 35, city='Beijing')
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# name: Bob age: 35 other: {'city': 'Beijing'}
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extra = {'city': 'Beijing', 'job': 'Engineer'}
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person('Bob', 35, **extra)
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# 命名关键字参数
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# 函数的调用者可以传入任意不受限制的关键字参数, *后面的参数被视为命名关键字参数
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def person_2(name, age, *, city='Beijing', job):
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print(name, age, city, job)
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# 参数组合
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def f1(a, b, c=0, *args, **kw):
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print('a =', a, 'b =', b, 'c =', c, 'args =', args, 'kw =', kw)
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# 使用命名关键字参数时，要特别注意，如果没有可变参数，就必须加一个*作为特殊分隔符
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def f2(a, b, c=0, d=1, *arg, e, **kw):
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print('a =', a, 'b =', b, 'c =', c, 'e =', e, 'kw =', kw, 'arg = ', arg)
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f2(1, 2, 3, 4, 56, 7, 8, 9, 0, e=4, f=9)
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# 练习
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def mul(*numbers):
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if not len(numbers) == 0:
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sum = 1
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for n in numbers:
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if not isinstance(n, (int, float)):
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continue # 跳出本次循环，执行下次循环
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sum *= n
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return sum
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else:
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raise TypeError('numbers must be a list')
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# 测试
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print('mul(5) =', mul(5))
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print('mul(5, 6) =', mul(5, 6))
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print('mul(5, 6, 7) =', mul(5, 6, 7))
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print('mul(5, 6, 7, 9) =', mul(5, 6, 7, 9))
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if mul(5) != 5:
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print('测试失败!')
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elif mul(5, 6) != 30:
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print('测试失败!')
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elif mul(5, 6, 7) != 210:
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print('测试失败!')
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elif mul(5, 6, 7, 9, 'test') != 1890:
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print('测试失败!')
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else:
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try:
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mul()
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print('测试失败!')
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except TypeError:
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print('测试成功!')
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# 递归
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def fact_1(n):
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if n == 1:
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return 1
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else:
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return n * fact(n - 1)
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# 尾递归优化
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def fact(n):
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return fact_iter(n, 1)
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def fact_iter(num, product):
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if num == 1:
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return product
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return fact_iter(num - 1, num * product)
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print('fact_iter', fact(10))
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# 汉诺塔问题实现
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# a存放起始柱，b存放辅助柱、c存放目标柱
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def move(n, a, b, c):
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if n == 1:
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print(a, '--->', c)
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else:
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move(n - 1, a, c, b) # 借助c把第 num 个以外的圆盘从a移动到b
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move(1, a, b, c) # 把第num个从a移动到c
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move(n - 1, b, a, c) # 借助a把第 num 个以外的圆盘从b移动到c
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move(3, 'A', 'B', 'C')

‎hello.py

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#!/usr/bin/env python3
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print('hello world')
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# name = input()
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print('1024 * 768 = ', 1024 * 768)
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print('I\'m learning\nPython.')
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print(r'\\\\\1233\\\\')
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print(r'''
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... hell\no
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... world
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''')
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print(3 > 2 and 2 > 3)
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print(not 3 > 2 or 2 > 3)
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age = 11
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if age >= 18:
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print('adult')
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else:
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print('teenager')
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x = 10
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x = x + 2
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print(x)
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print(10 / 3)
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s4 = r'''Hello,
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Lisa!'''
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print(s4)
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x = b'Hello'
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print(x)
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print('%2d-%2d' % (3002.22222, 1103.44444))
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print('%.2f-%.2f' % (3002.22222, 1103.44444))
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print('Hello, %s , I miss you, Do you miss me %.1f' %
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('zhaowenjuan', 1103.44444))
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r = 2.5
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s = 3.14 * r**2
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print(f'The area of a circle with radius {r} is {s:.2f}')

‎if.py

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# s = input('birth: ')
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# birth = int(s)
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# if birth < 2000:
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# print('00前')
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# else:
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# print('00后')
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print(84.5 / (1.75 ** 2))
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height = 1.75
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weight = 83.8
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bmi = weight / (height ** 2)
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print('bmi = %.f' % bmi)
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if bmi <= 18.5:
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print('过轻')
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elif bmi > 18.5 and bmi <= 25:
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print('正常')
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elif bmi > 25 and bmi <= 28:
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print('过重')
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elif bmi > 28 and bmi <= 32:
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print('肥胖')
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elif bmi > 32:
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print('严重肥胖')

‎import.py

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‎list.py

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import os
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# list 列表生成式
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classmates = ['Michael', 'Bob', 'Tracy']
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classmates.append('Admin')
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classmates.insert(2, 'Jack')
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# classmates.pop()
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print(classmates)
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print('classmates length : %d' % len(classmates))
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print('classmates length :', len(classmates))
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# tuple 元组
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tupleList = ('Michael', 'Bob', 'Tracy')
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print('tupleList length : %d' % len(tupleList))
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print([x * x for x in range(1, 11)])
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print([x * x for x in range(1, 11) if x % 2 == 0])
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print([m + n for m in 'ABC' for n in 'XYZ'])
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print([d for d in os.listdir('.')])
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L = ['Hello', 'World', 'IBM', 'Apple']
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print([x.lower() for x in L])
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print([x if x % 2 == 0 else -x for x in range(1, 11)])
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L1 = ['Hello', 'World', 18, 'Apple', None]
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L2 = [x.lower() for x in L1 if isinstance(x, str)]
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print('L2', L2)

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