Python基礎知識(二)–控制流程語句

控制流程語句：

1.if語句

 

  
lines = 1543 
  
if lines < 1000: 
  
 print("small") 
  
elif lines < 10000: 
  
 print("medium") 
  
else: 
  
 print("large") 
  
 
  
#medium 
  
#Python裡面用縮排代替了{}、begin..end之類的，看起來有點怪啊，不過習慣起來還好。每一個條件陳述式後面都要跟：，另外elseif被簡化成了elif 
 

2.while語句

 

  
while True: 
  
 line = input("請輸入一段字元:") 
  
 if not line: 
  
 break 
  
 print("您輸入的內容是：", line) 
 

3.for..in

 

  
for country in ["Denmark", "Finland", "Norway", "Swedan"]: 
  
 print(country) 
 

 

  
contries = ["Denmark", "Finland", "Norway", "Swedan"] 
  
for country in contries 
  
 print(country) 
 

 

  
for letter in "ABCDEFGHIJKLMNOPQRSTUVWXYZ": 
  
 if letter in "AEIOU": 
  
 print(letter, "is a vowel") 
  
 else: 
  
 print(letter, "is a consonant")