Python基礎知識(二)--控制流語句

控制流語句：

1.if語句

lines = 1543
if lines < 1000:
    print("small")
elif lines < 10000:
    print("medium")
else:
    print("large")

#medium
#Python裏面用縮進代替了{}、begin..end之類的，看起來有點怪啊，不過習慣起來還好。每一個條件語句後面都要跟：，另外elseif被簡化成了elif

 

2.while語句

while True:
    line = input("請輸入一段字符:")
    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")