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pythontips

admin 11月 12, 2020 0

basic grammer

print(‘Hello,world’)

r’’ no transfer

True False and or not None

list[‘one’,..] tuple(‘one’)

if aaa: elif bbb : else : while s > 0: print('there is no money')

dict = {‘name’:’kinleon’,’age’:25} s = set{[1,2,3,3]} s = {1,2,3}

abs(-20) max(1,2,3) int() hex()

def function(): return from fileName import functionName

higher property

切片
list[0:5:2] ‘abcdef’[:2]
迭代
for xx in …
from collections import Iterable
isinstance([1,2,3],Iterable) True
for i, value in enumerate([‘a’, ‘b’, ‘c’]):
for x,y in dict:
列表生成式 (PS:看到这我又一次感叹Python的变态)
list[1,2,3,4,5] = list(range(1,6))
[x * x for x in range(1, 11) if x % 2 == 0]
[m + n for m in ‘ABC’ for n in ‘XYZ’]
[k + ‘=’ + v for k, v in d.items()]
[s.lower() for s in L]
生成器
l = ()
斐波那契数列原理通过算法推算后面的内容
def fib(max): n, a, b = 0, 0, 1 while n < max: print(b) a, b = b, a + b n = n + 1 return 'done'
函数内部有yield 这个函数就是generator 生成器主要指的是一种机制一边循环一边计算