六个方面诠释Python的代码结构

>>> alphabet = 'abcdefg' + \ 
...                         'hijklmnop' + \ 
...                         'qrstuv' + \ 
...                         'wxyz'

>>> 1 + 2 + \
... 3
6

>>> count = 1
>>> while count <= 5:
...     print(count)
...     count += 1
...
1
2
3
4
5

>>> while True:
...     stuff = input("String to capitalize [type q to quit]:")
...     if stuff == 'q':
...             break
...     print(stuff.capitalize())
...
String to capitalize [type q to quit]:test
Test
String to capitalize [type q to quit]:darren chen
Darren chen
String to capitalize [type q to quit]:q

while True:
    value = input('Integer ,please [q to quit]:')
    if value == 'q':
        break
    number = int(value)
    if number % 2 == 0:
        continue
    print(number,'squared is',number*number)
    
Integer ,please [q to quit]:>? 1
1 squared is 1
Integer ,please [q to quit]:>? 2
Integer ,please [q to quit]:>? 3
3 squared is 9
Integer ,please [q to quit]:>? 5
5 squared is 25
Integer ,please [q to quit]:>? 6
Integer ,please [q to quit]:>? q

numbers = [1,3,5]
position = 0
while position < len(numbers):
    number = numbers[position]
    if number % 2 == 0:
        print(&#39;Found even number&#39;,number)
        break
    position += 1
else:
    print(&#39;No even number found&#39;)
...No even number found

word = 'Darren Chen'
for i in word:
    print(i)
    
D
a
r
r
e
n
C
h
e
n

home = {"man":'chenda','woman':'lvpeipei'}
for i in home:
    print(i)
    
man
woman

>>> for value in accusation. values(): 
...         print( value) 
...     
ballroom 
lead pipe

>>> cheeses = [] 
>>> for cheese in cheeses: 
...             print(' This shop has some lovely', cheese) 
...             break 
...      else: # 没有 break 表示 没有 找到 奶酪 .
..              print(' This is not much of a cheese shop, is it?') 
... 
This is not much of a cheese shop, is it?

>>> days = ['Monday', 'Tuesday', 'Wednesday'] 
>>> fruits = ['banana', 'orange', 'peach'] 
>>> drinks = ['coffee', 'tea', 'beer'] 
>>> desserts = ['tiramisu', 'ice cream', 'pie', 'pudding'] 
>>> for day, fruit, drink, dessert in zip( days, fruits, drinks, desserts): 
...         print( day, ": drink", drink, "- eat", fruit, "- enjoy", dessert) 
... 
Monday : drink coffee - eat banana - enjoy tiramisu 
Tuesday : drink tea - eat orange - enjoy ice cream 
Wednesday : drink beer - eat peach - enjoy pie

>>> english = 'Monday', 'Tuesday', 'Wednesday' 
>>> french = 'Lundi', 'Mardi', 'Mercredi'
>>> list( zip( english, french) ) 
[('Monday', 'Lundi'), ('Tuesday', 'Mardi'), ('Wednesday', 'Mercredi')]
#配合dict（）函数和zip（）函数的返回值就可以得到一本微型的词典：
>>> dict( zip( english, french) ) 
{'Monday': 'Lundi', 'Tuesday': 'Mardi', 'Wednesday': 'Mercredi'}

>>> for x in range( 0, 3): 
...         print( x) 
... 
0 
1 
2
>>> list( range( 0, 11, 2) ) 
[0, 2, 4, 6, 8, 10]

>>> number_ list = list( range( 1, 6)) 
>>> number_ list 
[1, 2, 3, 4, 5]
>>> number_ list = [number for number in range( 1, 6)] 
>>> number_ list 
[1, 2, 3, 4, 5]
>>> number_ list = [number- 1 for number in range( 1, 6)] 
>>> number_ list 
[0, 1, 2, 3, 4]
>>> a_ list = [number for number in range( 1, 6) if number % 2 == 1] 
>>> a_ list
[1,3,5]
#嵌套循环
>>> rows = range( 1, 4) 
>>> cols = range( 1, 3) 
>>> cells = [(row, col) for row in rows for col in cols] 
>>> for cell in cells: 
...         print( cell) 
... 
(1, 1) 
(1, 2) 
(2, 1) 
(2, 2) 
(3, 1) 
(3, 2)

{ key_ expression : value_ expression for expression in iterable }
>>> word = 'letters' 
>>> letter_ counts = {letter: word. count( letter) for letter in set( word)} 
>>> letter_ counts 
{'t': 2, 'l': 1, 'e': 2, 'r': 1, 's': 1}

>>> a_ set = {number for number in range( 1, 6) if number % 3 == 1} 
>>> a_ set 
{1, 4}

>>> number_ thing = (number for number in range( 1, 6))
>>> type( number_ thing) 
< class &#39;generotor&#39;>
#可以直接对生成器对象进行迭代
>>> for number in number_ thing: 
...             print( number) 
... 
1 
2 
3 
4 
5

>>> number_ list = list( number_ thing) 
>>> number_ list 
[1, 2, 3, 4, 5]
    一个生成器只能运行一

>>> try_ again = list( number_ thing) 
>>> try_ again 
[ ]