禅道——Pythonic

Python由其语言简洁性，使得写出优雅、地道和整洁的代码成为的一种禅道，最近工作中感触尤甚，特地回顾了基础知识，这里总结几种Pythonic的写法，自己备用。

定期整理点滴，完善自己，今后给我洋哥挣大钱，带她过好生活，陪伴着让我的小宝贝发自内心爱上笑，加油吧

python.txt:
hello, python

####1、变量交换

a = 0
b = 1
a, b = b, a
print('a =', a, '\nb =', b)

####2、列表推导

my_list = [i * 2 for i in range(10)]
print(my_list)

####3、带索引遍历

for i, item in enumerate(my_list):
    print(i, '-->', item)

####4、序列解包

a, *rest = [1, 2, 3]
print('a =', a, 'rest =', rest)
a, *middle, c = [1, 2, 3, 4]
print('a =', a, 'middle =', middle, 'c =', c)

####5、字符串拼接

letters = ['s', 'p', 'a', 'm']
print(''.join(letters))

####6、真假判断

a = 1
if a:
    print('a is True')

if not a:
    print('a is False')

a = None
if a is None:
   print('a is None')

####7、访问字典元素

d = {'hello':'python'}
print(d.get('hello','default_value'))
print(d.get('things','default_value'))

> Or

if 'hello' in d:
    print dict['hello']

####8、操作列表

a = [3, 4, 5]
b = [i for i a if i > 4]
> Or
b = list(filter(lambda x: x > 4, a))
print(b)

a = [i + 3 for i in a]
> Or
a = list(map(lambda x: x + 3, a))
print(a)

####9、文件读取

with open('python.txt') as f:
    for line in f:
        print(line)

####10、代码续行

my_very_big_string = (
    "For a long time I used to go to bed early. Sometimes, "
    "when I had put out my candle, my eyes would close so quickly "
    "that I had not even time to say “I’m going to sleep.”"
)

####11、显式

def make_complex(x, y):
    return {'x': x, 'y': y}

####12、用占位符

filename = 'python.txt'
basename, _, ext = filename.rpartition('.')

####* 链操作

if 18 < age < 60:
    print('young man')
print(True == False == True)

####* 三目运算

a = 3
b = 2 if a > 2 else 1
print(b)

a = 3, b = 1
print(a if a >= b else b)

def find_max(a, b, c):
    return a if a > b and a > c else (b if b > a and b > c else c)

计划写一系列完整的文章巩固所学，日后会做目录进行整理。
2018年9月11日17时于广州逸夫科学馆

定期整理点滴，完善自己，今后给我洋哥挣大钱，带她过好生活，陪伴着让我的小宝贝发自内心爱上笑，加油吧

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