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              Python for 循環語句【每日一個知識點第115期-Python】

              Python for循環可以遍歷任何序列的項目,如一個列表或者一個字符串。

              語法:

              for循環的語法格式如下:

              for iterating_var in sequence:
                 statements(s)

              流程圖:

              python_for_loop

              實例:

              實例

              #!/usr/bin/python # -*- coding: UTF-8 -*- for letter in Python: # 第一個實例 print 當前字母 :, letter fruits = [banana, apple, mango] for fruit in fruits: # 第二個實例 print 當前水果 :, fruit print Good bye!

              嘗試一下 ?

              以上實例輸出結果:

              當前字母 : P
              當前字母 : y
              當前字母 : t
              當前字母 : h
              當前字母 : o
              當前字母 : n
              當前水果 : banana
              當前水果 : apple
              當前水果 : mango
              Good bye!

               


              通過序列索引迭代

              另外一種執行循環的遍歷方式是通過索引,如下實例:

              實例

              #!/usr/bin/python # -*- coding: UTF-8 -*- fruits = [banana, apple, mango] for index in range(len(fruits)): print 當前水果 :, fruits[index] print Good bye!

              以上實例輸出結果:

              當前水果 : banana
              當前水果 : apple
              當前水果 : mango
              Good bye!

              以上實例我們使用了內置函數 len() 和 range(),函數 len() 返回列表的長度,即元素的個數。 range返回一個序列的數。

               


              循環使用 else 語句

              在 python 中,for … else 表示這樣的意思,for 中的語句和普通的沒有區別,else 中的語句會在循環正常執行完(即 for 不是通過 break 跳出而中斷的)的情況下執行,while … else 也是一樣。

              實例

              #!/usr/bin/python # -*- coding: UTF-8 -*- for num in range(10,20): # 迭代 10 到 20 之間的數字 for i in range(2,num): # 根據因子迭代 if num%i == 0: # 確定第一個因子 j=num/i # 計算第二個因子 print %d 等于 %d * %d % (num,i,j) break # 跳出當前循環 else: # 循環的 else 部分 print num, 是一個質數

              嘗試一下 ?

              以上實例輸出結果:

              10 等于 2 * 5
              11 是一個質數
              12 等于 2 * 6
              13 是一個質數
              14 等于 2 * 7
              15 等于 3 * 5
              16 等于 2 * 8
              17 是一個質數
              18 等于 2 * 9
              19 是一個質數
              

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