15条常用Python小技巧

x, y = 1, 2
print(x, y)
x, y = y, x
print(x, y)

sentence_list = ["my", "name", "is", "George"]
sentence_string = " ".join(sentence_list)
print(sentence_string)

sentence_string = "my name is George"
sentence_string.split()
print(sentence_string)

[0]*1000 # List of 1000 zeros
[8.2]*1000 # List of 1000 8.2's

x = {'a': 1, 'b': 2}
y = {'b': 3, 'c': 4}
z = {**x, **y}

name = "George"
name[::-1]

def get_a_string():
      a = "George"
      b = "is"
      c = "cool"
      return a, b, c
sentence = get_a_string()
(a, b, c) = sentence

a = [1, 2, 3]
b = [num*2 for num in a] # Create a new list by multiplying each element in a by 2

m = {'a': 1, 'b': 2, 'c': 3, 'd': 4}
for key, value in m.items():
    print('{0}: {1}'.format(key, value))

m = ['a', 'b', 'c', 'd']
for index, value in enumerate(m):
    print('{0}: {1}'.format(index, value))

a_list = list()
a_dict = dict()
a_map = map()
a_set = set()

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

test = [1, 2, 3, 4, 2, 2, 3, 1, 4, 4, 4]
print(max(set(test), key = test.count))

import sys
x = 1
print(sys.getsizeof(x))

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