Python学习之如何简化代码?六大技巧!

  众所周知,对比其他编程语言,Python更加简洁优雅、语法清晰,可以实现庞大的功能,那么Python开发如何简化代码呢?我们一起来看看方法吧。

  1. 列表推导式

  对于一组列表,如果想让其所有元素翻倍,很多人都会采用以往比较经典的写法,其实Python中有更精简的办法,实例如下:

  以往做法:

  num = [1, 3, 5, 7, 9]

  for i in range(len(num)):

  num[i] = num[i] * 3

  Python简化写法:

  num = [1, 3, 5, 7, 9]

  bag = [elem * 3 for elem in num]

  2. 遍历列表

  传统遍历列表是用函数表示列表的长度进行循环遍历,Python3可以省略这一步,更加简洁!

  以往做法:

  num = [1, 3, 5, 7, 9]

  for i in range(len(num)):

  print(num[i])

  Python简化写法:

  num = [1, 3, 5, 7, 9]

  for i in num:

  print(i)

  3. 元素互换

  对于元素互换,传统做法需要设定一个中间变量,进行数值的承接,Python元素互换变得简单了很多。

  以往做法:

  a = 3

  b = 4

  c = a

  a = b

  b = c

  Python简化写法:

  a = 3

  b = 4

  a,b = b,a

  4. 初始化列表

  Python也有简洁的初始化列表表示方法,具体简洁程度,举个例子感受一下吧,以下是要一个是8个整数1的列表

  以往做法:

  bag = []

  for _ in range(8):

  bag.append(1)

  Python简化写法:

  bag = [1] * 8

  5. 构造字符串

  经常打印字符串,需要用到构造函数,传统写法需要很多连接符和参数比较复杂,Python用法就简洁很多,以下是相关实例:

  以往做法:

  name = “oldboy”

  age = “30”

  born_in = “beijing”

  str = "Hello my name is " + name + "and I'm " + str(age) + " years old. I was born in " + born_in + "."

  print(str)

  Python简化写法:

  name = “oldboy”

  age = “30”

  born_in = “beijing”

  str = "Hello my name is {0} and I'm {1} years old. I was born in {2}.".format(name, age, born_in)

  print(str)

  6.返回tuples元组

  Python允许一个函数中返回多个元素,以下是解包元组实例:

  以往做法:

  def binary():

  return 0, 1

  result = binary()

  zero = result[0]

  one = result[1]

  Python简化写法:

  def binary():

  return 0, 1

  zero, one = binary()

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