1、交换值

x, y = 1, 2

print(x, y)

x, y = y, x

print(x, y)

2、将字符串列表合并为一个字符串列表

sentence_list = ["my", "name", "is", "George"]

sentence_string = " ".join(sentence_list)

print(sentence_string)

3、将字符串分割为子字符串列表

sentence_string = "my name is George"

sentence_string.split()

print(sentence_string)

4、初始化一个包含数字的列表

[0]*1000 # List of 1000 zeros 

[8.2]*1000 # List of 1000 8.2's

5、合并字典

x = {'a': 1, 'b': 2}

y = {'b': 3, 'c': 4}

z = {**x, **y}

6、扭转一个字符串

name = "George"

name[::-1]

7、从函数返回多个值

def get_a_string():

      a = "George"

      b = "is"

      c = "cool"

      return a, b, c

sentence = get_a_string()

(a, b, c) = sentence

8、列表推导

a = [1, 2, 3]

b = [num*2 for num in a] # Create a new list by multiplying each element in a by 2

9、迭代字典

m = {'a': 1, 'b': 2, 'c': 3, 'd': 4} 

for key, value in m.items():

    print('{0}: {1}'.format(key, value))

10、在获取索引时迭代列表值

m = ['a', 'b', 'c', 'd']

for index, value in enumerate(m):

    print('{0}: {1}'.format(index, value))

11、初始化空容器

a_list = list()

a_dict = dict()

a_map = map()

a_set = set()

12、删除字符串末尾的无用字符

name = " George "

name_2 = "George///"

name.strip() # prints "George"

name_2.strip("/") # prints "George"

13、找出列表中最常见的元素

test = [1, 2, 3, 4, 2, 2, 3, 1, 4, 4, 4]

print(max(set(test), key = test.count))

14、检查对象的内存使用情况

import sys

x = 1

print(sys.getsizeof(x))

15、将dict转换为XML

from xml.etree.ElementTree import Elementdef dict_to_xml(tag, d):

    '''

    Turn a simple dict of key/value pairs into XML

    '''

    elem = Element(tag)

    for key, val in d.items():

        child = Element(key)

        child.text = str(val)

        elem.append(child)

    return elem

总结：