python零碎知识点

1.argparse

2.replace

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1.argparse

　　argparse tutorial地址：https://docs.python.org/3/howto/argparse.html#introducing-positional-arguments

2.replace

　　replace()方法把字符串中的old（字符串）换成new（字符串），若指定第三个参数，则是规定替换不超过n次

>>>str = "this is string example....wow!!! this is really string"
>>>print str.replace("is", "was")
thwas was string example....wow!!! thwas was really string