Python直環函數

python中的for迴圈

1. <span class="com">#for迴圈格式（類似Java中的foreach）：for 識別符in 列表名稱:</span>

2. <span class="pun">#>>></span><span class="pln"># movies </span><span class="pun">=</span><span class="pln"> </span><span class="pun">[</span><span class="str">"movie1"</span><span class="pun">,</span><span class="str">"movie2"</span><span class="pun">,</span><span class="str">"movie3"</span><span class="pun">]</span>

3. <span class="pun">#>>></span><span class="pln"> </span><span class="kwd">for</span><span class="pln"> item </span><span class="kwd">in</span><span class="pln"># movies </span><span class="pun">:</span>

4. <span class="pln"></span><span class="kwd">print</span><span class="pun">(</span><span class="pln">item</span><span class="pun">)</span>

6. <span class="pln"></span>

7. <span class="pln"></span>

   #movie1

8. <span class="pln"></span>

   #movie2

9. <span class="pln"></span>

   movie3

其中：for表示循環開始，要出現在標識符前面；in將要循環的列表與標識符分隔開；:放在列表名後面，表示處理列表代碼開始；請注意，列表處理代碼必須放在for迴圈下面並縮排！ ！ ！

當for迴圈開始時，python會將列表中的每一個值分別賦給標識符，這也意味著每次循環標識符的值都不一樣；循環會一直迭代，直到處理完列表中的所有資料。

python中的while迴圈

1. <span class="com">##while迴圈格式：while 迴圈條件：</span>

2. <span class="pun">>>></span><span class="pln"> </span><span class="kwd">while</span><span class="pln"> count </span> <span class="pun"><</span><span class="pln"> len</span><span class="pun">(</span><span class="pln">movies</span><span class="pun">)</span><span class="pln"> </span><span class="pun">#:</span>

3. <span class="pln"></span>print(movies#[count])

4. # count ##=<span class="pln"></span><span class="pln"></span> # count

5. 1

6. <span class="pln"></span>

7. <span class="pln"></span>

8. #movie1<span class="pln"></span>

   ############movie2##########

9. <span class="pln">movie3</span>

#while迴圈與for迴圈相比，多了條件判斷的語句，既可以自訂循環結束的條件

python的判斷

1. <span class="kwd">if</span><span class="pln"> </span><span class="pun">滿足某個條件</span><span class="pln"> </span><span class="pun">:</span>

2. <span class="pln">#    </span><span class="pun">#執行某些語句</span>

3. <span class="kwd">else</span><span class="pln"> </span><span class="pun">:</span>

4. <span class="pln">    </span><span class="pun">#執行某些語句</span>

注意：if語句與else語句最後都要加上:，if與else後面要執行的程式碼都要縮排

#python的函數

1. ##>>> new_movies <span class="pln"></span>=<span class="pln"></span>["movie1","movie2","movie3",["movie4_1","movie4_2",["movie_4_3_1","movie_4_3_2" ]],"movie5"]

2. #>> > <span class="pln"></span>def listItems<span class="pln"></span>#(items<span class="pln"></span>) <span class="pln"></span>:#

3. <span class="pln">        </span><span class="kwd">#對於</span><span class="pln">專案</span><span class="kwd">在</span><span class="pln">專案</span><span class="pun">#中： </span>

4.            if# isinstance#(<span class="pln"></span> #item,<span class="pln"></span>清單)<span class="pln"></span>:

5. <span class="pln"></span>                listItems(<span class="pln"></span>item)

6. ##item)<span class="pln"></span>1

7. <span class="pln"></span><span class="pln"></span>

9. <span class="pln"></span>

10. ##夫足夠#＃＃＃＃＃＃＃＃＃＃＃ ＃＃＃＃＃ 打印<span class="pln"></span>(項目<span class="pln"></span>#)

11. <span class="pln"></span>

    #######################################> >>> ###### listItems######（######new_movies######）###################################################################################################### ### ##電影1##########

12. <span class="pln">movie2</span>

13. <span class="pln">#movie3</span>

14. <span class="pln"></span>

15. <span class="pln"></span>

16. <span class="pln"></span>

17. <span class="pln"></span>

    #movie4_1

18. <span class="pln"></span>

    movie4_2

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