The while loop in python prints the four shapes of stars

Continuously output five lines of * on the console, and the number of each asterisk increases once [Recommended reading: Python video tutorial]
*
**
***
****
*****

#1.定义一个行计数器row = 1while row <= 5:    #定义一个列计数器
    col = 1
    #开始循环
    while col <= row:
        print(&#39;*&#39;,end=&#39;&#39;)
        col += 1
    print(&#39;&#39;)
    row += 1

#1.定义一个行计数器row = 1while row <= 5:    #定义一个列计数器
    col = 5
    #开始循环
    while col >= row:
        print(&#39;*&#39;,end=&#39;&#39;)
        col -= 1
    print(&#39;&#39;)
    row += 1

row = 1while row <= 5:  # 行数，循环五次
    a = 1
    col = 1
    while a <= 5 - row:  # a控制每行的空格数=5-行数，例如：第一行为5-1=4个空格
        print(&#39; &#39;, end=&#39;&#39;)  # 不换行
        a += 1
    while col <= row:  # col控制*的数量=行数
        print(&#39;*&#39;, end=&#39;&#39;)
        col += 1
    print()
    row += 1

row = 1while row <= 5:  # 行数，循环五次
    a = 1
    col = 1
    while a <= row - 1:  # a控制每行的空格数=5-行数，例如：第一行为5-1=4个空格
        print(&#39; &#39;, end=&#39;&#39;)  # 不换行
        a += 1
    while  col <= 6-row:  # col控制*的数量=行数
        print(&#39;*&#39;, end=&#39;&#39;)
        col += 1
    print()
    row += 1

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