Python 是一門非常簡潔的語言，python的簡潔易用令人不得不感嘆這門語言的輕巧。在本文中，我們列舉了 17 個非常有用的 Python 技巧，這 17 個技巧都非常簡單，但它們都很常用且能激發不一樣的思路。
很多人都知道 Python 是一種高階程式語言，其設計的核心概念是程式碼的易讀性，以及允許程式設計者通過若干行程式碼輕鬆表達想法創意。實際上，許多人選擇學習 Python 的首要原因是其程式設計的優美性，用它編碼和表達想法非常自然。此外，Python 的編寫使用方式有多種，資料科學、網頁開發、機器學習皆可使用 Python。 Quora、Pinterest 和 Spotify 都使用 Python 作為其後端開發語言。
交換變數值
#
"""pythonic way of value swapping""" a, b=5,10 print(a,b) a,b=b,a print(a,b)
將清單中的所有元素組合成字串
a=["python","is","awesome"]
print(" ".join(a))#查找清單中頻##率最高的值
"""most frequent element in a list""" a=[1,2,3,1,2,3,2,2,4,5,1] print(max(set(a),key=a.count)) """using Counter from collections""" from collections import Counter cnt=Counter(a) print(cnt.most_commin(3))
檢查兩個字串是不是由相同字母不同順序組成
#
from collections import Counter Counter(str1)==Counter(str2)
反轉字串
"""reversing string with special case of slice step param""" a ='abcdefghij k lmnopqrs tuvwxyz 'print(a[ ::-1] ) """iterating over string contents in reverse efficiently.""" for char in reversed(a): print(char ) """reversing an integer through type conversion and slicing .""" num = 123456789 print( int( str(num)[::1]))
反轉清單#
"""reversing list with special case of slice step param""" a=[5,4,3,2,1] print(a[::1]) """iterating over list contents in reverse efficiently .""" for ele in reversed(a): print(ele )
轉置二維陣列
"""transpose 2d array [[a,b], [c,d], [e,f]] -> [[a,c,e], [b,d,f]]""" original = [['a', 'b'], ['c', 'd'], ['e', 'f']] transposed = zip( *original ) print(list( transposed) )
#鍊式比較
""" chained comparison with all kind of operators""" b =6 print(4< b < 7 ) print(1 == b < 20)
鍊式函數呼叫
"""calling different functions with same arguments based on condition"""
def product(a, b):
return a * b
def add(a, b):
return a+ b
b =True
print((product if b else add)(5, 7))##複製列表
"""a fast way to make a shallow copy of a list""" b=a b[0]= 10 """ bothaandbwillbe[10,2,3,4,5]""" b = a[:]b[O] = 10 """only b will change to [10, 2, 3, 4, 5] """ """copy list by typecasting method""" a=[l,2,3,4,5] print(list(a)) """using the list.copy( ) method ( python3 only )""" a=[1,2,3,4,5] print(a.copy( )) """copy nested lists using copy. deepcopy""" from copy import deepcopy l=[l,2],[3,4]] l2 = deepcopy(l) print(l2)
#字典get法
""" returning None or default value, when key is not in dict""" d = ['a': 1, 'b': 2] print(d.get('c', 3))
"""Sort a dictionary by its values with the built-in sorted( ) function and a ' key' argument ."""
d = {'apple': 10, 'orange': 20, ' banana': 5, 'rotten tomato': 1)
print( sorted(d. items( ), key=lambda x: x[1]))
"""Sort using operator . itemgetter as the sort key instead of a lambda"""
from operator import itemgetter
print( sorted(d. items(), key=itemgetter(1)))
"""Sort dict keys by value"""
print( sorted(d, key=d.get))"""else gets called when for loop does not reach break statement""" a=[1,2,3,4,5] for el in a: if el==0: break else: print( 'did not break out of for loop' )
#轉換清單為逗號分割符格式
"""converts list to comma separated string""" items = [foo', 'bar', 'xyz'] print (','.join( items)) """list of numbers to comma separated""" numbers = [2, 3, 5, 10] print (','.join(map(str, numbers))) """list of mix data""" data = [2, 'hello', 3, 3,4] print (','.join(map(str, data)))
合併字典
#"""merge dict's"""
d1 = {'a': 1}
d2 = {'b': 2}
# python 3.5
print({**d1, **d2})
print(dict(d1. items( ) | d2. items( )))
d1. update(d2)
print(d1)
清單中最小和最大的索引
"""Find Index of Min/Max Element .
"""
lst= [40, 10, 20, 30]
def minIndex(lst):
return min( range(len(lst)), key=lst.. getitem__ )
def maxIndex(lst):
return max( range( len(lst)), key=lst.. getitem__ )
print( minIndex(lst))
print( maxIndex(lst))
移除清單中的重複元素
"""remove duplicate items from list. note: does, not preserve the original list order""" items=[2,2,3,3,1] newitems2 = list(set( items)) print (newitems2) """remove dups and, keep. order""" from collections import OrderedDict items = ["foo", "bar", "bar", "foo"] print( list( orderedDict.f romkeys(items ).keys( )))
以上，就是關於Python程式設計中的17個實用且有效的小操作
以上是Python學習之17個關於Python的小技巧的詳細內容。更多資訊請關注PHP中文網其他相關文章！
