30个极简Python代码，拿走就能用！

def all_unique(lst): return len(lst)== len(set(lst)) x = [1,1,2,2,3,2,3,4,5,6] y = [1,2,3,4,5] all_unique(x) # False all_unique(y) # True

from  collections  import  Counter def anagram (first, second) : return Counter(first) == Counter(second) anagram( "abcd3" , "3acdb" ) # True

import sys variable = 30 print(sys.getsizeof(variable)) # 24

def   byte_size (string) : return (len(string.encode( ’utf-8’ ))) byte_size( ’’ ) # 4 byte_size( ’Hello World’ ) # 11

n = 2 s = "Programming" print(s * n) # ProgrammingProgramming

s =  "programming is awesome" print(s.title()) # Programming Is Awesome

from  math  import  ceil def chunk (lst, size) : return list( map( lambda x: lst[x * size:x * size + size], list(range( 0 , ceil(len(lst) / size))))) chunk([ 1 , 2 , 3 , 4 , 5 ], 2 ) # [[1,2],[3,4],5]

def   compact (lst) : return list(filter(bool, lst)) compact([ 0 , 1 , False , 2 , ’’ , 3 , ’a’ , ’s’ , 34 ]) # [ 1, 2, 3, ’a’, ’s’, 34 ]

array  = [[ ’a’ ,  ’b’ ], [ ’c’ ,  ’d’ ], [ ’e’ ,  ’f’ ]] transposed = zip(* array ) print(transposed) # [( ’a’ , ’c’ , ’e’ ), ( ’b’ , ’d’ , ’f’ )]

a = 3 print ( 2 < a < 8) # True print (1 == a < 2) # False

hobbies = [ "basketball" ,  "football" ,  "swimming" ] print( "My hobbies are: " + ", " .join(hobbies)) # My hobbies are: basketball, football, swimming

import re def count_vowels (str) : return len(len(re.findall( r’[aeiou]’ , str, re.IGNORECASE))) count_vowels( ’foobar’ ) # 3 count_vowels( ’gym’ ) # 0

def decapitalize (string) : return str[: 1 ].lower() + str[ 1 :] decapitalize( ’FooBar’ ) # ’fooBar’ decapitalize( ’FooBar’ ) # ’fooBar’

def   spread (arg) : ret = [] for i in arg: if isinstance(i, list): ret.extend(i) else : ret.append(i) return ret def deep_flatten (lst) : result = [] result.extend( spread(list(map( lambda x: deep_flatten(x) if type(x) == list else x, lst)))) return result deep_flatten([ 1 , [ 2 ], [[ 3 ], 4 ], 5 ]) # [1,2,3,4,5]

def difference(a, b): set_a = set(a) set_b = set(b) comparison = set_a.difference(set_b) return list(comparison) difference([1,2,3], [1,2,4]) # [3]

def   difference_by (a, b, fn) : b = set(map(fn, b)) return [item for item in a if fn(item) not in b] from math import floor difference_by([ 2.1 , 1.2 ], [ 2.3 , 3.4 ],floor) # [1.2] difference_by([{ ’x’ : 2 }, { ’x’ : 1 }], [{ ’x’ : 1 }], lambda v : v[ ’x’ ]) # [ { x: 2 } ]

def   add (a, b) : return a + b def subtract (a, b) : return a - b a, b = 4 , 5 print((subtract if a > b else add)(a, b)) # 9

def has_duplicates(lst): return len(lst) != len(set(lst)) x = [1,2,3,4,5,5] y = [1,2,3,4,5] has_duplicates(x) # True has_duplicates(y) # False

def   merge_two_dicts (a, b) : c = a.copy() # make a copy of a c.update(b) # modify keys and values of a with the once from b return c a={ ’x’ : 1 , ’y’ : 2 } b={ ’y’ : 3 , ’z’ : 4 } print(merge_two_dicts(a,b)) #{’y’:3,’x’:1,’z’:4}

def  merge_dictionaries (a, b) return {**a, **b} a = { ’x’ : 1 , ’y’ : 2 } b = { ’y’ : 3 , ’z’ : 4 } print(merge_dictionaries(a, b)) # { ’y’ : 3 , ’x’ : 1 , ’z’ : 4 }

def to_dictionary( keys ,  values ): return dict(zip( keys , values )) keys = [ "a" , "b" , "c" ] values = [ 2 , 3 , 4 ] print (to_dictionary( keys , values )) #{’a’: 2, ’c’: 4, ’b’: 3}

list = [ "a" ,  "b" ,  "c" ,  "d" ] for index, element in enumerate ( list ): print ( "Value" , element, "Index " , index, ) # ( ’Value’ , ’a’ , ’Index ’ , 0 ) # ( ’Value’ , ’b’ , ’Index ’ , 1 ) #( ’Value’ , ’c’ , ’Index ’ , 2 ) # ( ’Value’ , ’d’ , ’Index ’ , 3 )

import time start_time = time.time() a = 1 b = 2 c = a + b print(c) #3 end_time = time.time() total_time = end_time - start_time print("Time: ", total_time) # (’Time: ’, 1.1205673217773438e-05)

try : 2 * 3 except TypeError: print( "An exception was raised" ) else : print( "Thank God, no exceptions were raised." ) #Thank God, no exceptions were raised.

def most_frequent( list ): return max(set( list ), key = list .count) list = [ 1 , 2 , 1 , 2 , 3 , 2 , 1 , 4 , 2 ] most_frequent( list )

def   palindrome (string) : from re import sub s = sub( ’[W_]’ , ’’ , string.lower()) return s == s[:: -1 ] palindrome( ’taco cat’ ) # True

import  operator action = { "+" : operator . add , "-" : operator .sub, "/" : operator .truediv, "*" : operator .mul, "**" : pow } print(action[ ’-’ ]( 50 , 25 )) # 25

from copy import deepcopy from random import randint def shuffle(lst): temp_lst = deepcopy(lst) m = len(temp_lst) while (m): m -= 1 i = randint(0, m) temp_lst[m], temp_lst[i] = temp_lst[i], temp_lst[m] return temp_lst foo = [1,2,3] shuffle(foo) # [2,3,1] , foo = [1,2,3]

def spread (arg) : ret = [] for i in arg: if isinstance(i, list): ret.extend(i) else : ret.append(i) return ret spread([ 1 , 2 , 3 ,[ 4 , 5 , 6 ],[ 7 ], 8 , 9 ]) # [1,2,3,4,5,6,7,8,9]

def   swap (a, b) : return b, a a, b = -1 , 14 swap(a, b) # (14, -1) spread([ 1 , 2 , 3 ,[ 4 , 5 , 6 ],[ 7 ], 8 , 9 ]) # [1,2,3,4,5,6,7,8,9

d = { ’a’ : 1, ’b’ : 2} print (d.get( ’c’ , 3)) # 3