关于Python的20个奇技淫巧

from collections import Counter
words = '''我明白你的意思，你的意思就是想意思意思，但是你不明白我的意思，我的意思是你不用意思意思。'''word_counts = Counter(words) top_three = word_counts.most_common(3) print(top_three) 
# 输出：[('意', 8), ('思', 8), ('你', 4)]

import pypinyinwords = "床前明月光"pypinyin.pinyin(words)
# 输出：[['chuáng'], ['qián'], ['míng'], ['yuè'], ['guāng']]

import os files = os.listdir("E:\\testfile\\") if any(name.endswith('.py') for name in files):    print(1)

row = ["我", "爱", "python"] print(*row,sep="")
# 输出：我爱python

from datetime import dated1 = date(2020,1,1) d2 = date(2020,9,13) print(abs(d2-d1).days)
# 输出：256

比如'x=11,y=20'拆解成{'x': 42.0, 'y': 1.0}

kvp = lambda elem,t,i: t(elem.split('=')[i]) parse_kvp_str = lambda args : dict([(kvp(elem,str,0), kvp(elem,float,1)) for elem in args.split(',')]) parse_kvp_str('x=11,y=20') 
# 输出：{'x': 42.0, 'y': 1.0}

a = 1b = 2a, b = b, a

d = {} d.setdefault(2, []).append(23) d.setdefault(2, []).append(11) d[2] 
# 输出：[23, 11]

test = [1, 2, 3, 5, 2, 2, 3, 1, 2, 6, 2] print(max(set(test), key = test.count)) 
# 输出：2

import sys x = 1print(sys.getsizeof(x)) 
# 输出：28

import string, random randword = lambda n: "".join([random.choice(string.ascii_letters) for i in range(n)])
# 输出：'qsNWZF'

words = lambda text: ''.join(c if c.isalnum() else ' ' for c in text).split() words('Johnny.Appleseed!is:a*good&farmer') 
# 输出：['Johnny', 'Appleseed', 'is', 'a', 'good', 'farmer']

import time import sys for progress in range(100):   time.sleep(0.1)   sys.stdout.write("Download progress: %d%%   \r" % (progress) )    sys.stdout.flush() 

a = 'Python is a powerful languange.'print(a[::-1])
# 输出：.egnaugnal lufrewop a si nohtyP

list1 = ['Scott', 'Eric', 'Kelly', 'Emma', 'Smith']list2 = ['Scott', 'Eric', 'Kelly']
set1 = set(list1)set2 = set(list2)
list3 = list(set1.symmetric_difference(set2))print(list3)
# 输出：['Emma', 'Smith']

listNumbers = [20, 22, 24, 26, 28, 28, 20, 30, 24]list(set(listNumbers))
# 输出：[20, 22, 24, 26, 28, 30]

ItemId = [54, 65, 76]names = ["Hard Disk", "Laptop", "RAM"]itemDictionary = dict(zip(ItemId, names))print(itemDictionary)
# 输出：{54: 'Hard Disk', 65: 'Laptop', 76: 'RAM'}

punctuations = '''!()-[]{};:'"\,<>./?@#$%^&*_~，。！？'''my_str = "你好，!!我的网名叫作：隔-壁-老-王。"
# 移除标点no_punct = ""for char in my_str:   if char not in punctuations:       no_punct = no_punct + char
print(no_punct)
# 输出：你好我的名字叫作：隔壁老王

import os  
MESSAGE = '该文件已经存在.'TESTDIR = 'testdir'try:    home = os.path.expanduser("~")      print(home)  
    if not os.path.exists(os.path.join(home, TESTDIR)):          os.makedirs(os.path.join(home, TESTDIR))      else:        print(MESSAGE)except Exception as e:    print(e)

def f():    return 1,2,3,4 
a,b,c,d = f()print(a,b,c,d) 
# 输出：1,2,3,4