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Python-迴圈

Python

迴圈概念說明:

基本語法:

while範例

while True:
     command = input('Your command : ')
     if command == 'q':
          break
     else:
         print(command)

程式碼說明

在while 後面加上條件式,範例是直接加一個true,此時while判斷為true時,迴圈不會停止,在while行結束時要加上:,下一行開始要縮排,表示在while迴圈內部,範例程式是,等待輸入,判斷輸入為q則離開,不為q則print出來。

for範例

for i in range(10):
    print(i)

for i in [1,3,5,6]:
    print(i)

a = [1,3,5,6]
for i in a:
    print(i)


程式碼說明

range(10) = [0,1,2,3,4,5,6,7,8,9]
i 定義變數
in 指定i 為in後面的可迭代物件的內容,並依可迭代物件順序,賦予i值
for 根據後方可迭代物件的長度決定執行次數,結尾時要加上:,下一行開始要縮排,其縮排內容皆為for迴圈內容

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