出个Python练习题做做：去掉注释
学Python肯定要做习题，给自己出了道：写一个程序，把自己的代码打开，去掉所有注释的字符(如果整行都注释了，那这一行就不要了)，再把去掉注释后的代码打印出来。
写完之后在程序代码后面加上这段测试数据并运行看结果怎样。
"=================TEST DATA======================" #line comment... a = 123 # half comment... "#"'#' '"#' '\'#' '"'#'
结果就是：
"=================TEST DATA======================" a = 123 "#"'#' '"#' '\'#' '"'
这个答案是从Python自带的编辑器的颜色显示得来的。我的程序：
f = open(__file__,'r') # open itself
for eachline in f: count1 = 0 # count the number of ' count2 = 0 # count the number of " for i in range(len(eachline)): if eachline[i]=="'" and count2%2==0 and (i==0 or eachline[i-1]!='\\'): count1+=1 if eachline[i]=='"' and count1%2==0 and (i==0 or eachline[i-1]!='\\'): count2+=1 if eachline[i]=='#' and count1%2==0 and count2%2==0: break if eachline[0]!='#': print eachline[0:i]
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