遍历循环保留字

s="python"
while s!="":
    for c in s:
        if c=="t":
            break
        print(c,end='')
    s=s[:-1]
输出结果：pypypypypyp

s="python"
while s!="":
    for c in s:
        if c=="t":
            continue
        print(c,end='')
    s=s[:-1]
输出结果：pyhonpyhopyhpypyp