47 lines
1.3 KiB
Markdown
47 lines
1.3 KiB
Markdown
---
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title: Relationships between * and args
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localeTitle: '*和args之间的关系'
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---
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## 在函数定义中存在\*
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```Python
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# How does *args work in a function definition
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def hardFunc(arg1, arg2):
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# create a tuple and pollute it with arguments passed to hardFunc
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args=(arg1, arg2)
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# print out results
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print(args[0])
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print(args[1])
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hardFunc('hard_one', 'hard_two')
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# output — Try it yourself now and in sequential snippets!
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def softFunc(*args):
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# at this point after calling softFunc a tuple with a name of a word
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# followed by * is created automatically (in this case the name is args)
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# print out results
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print(args[0])
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print(args[1])
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softFunc('soft_one', 'soft_two')
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# Now try to do something illegal
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hardFunc('one', 'two', 'three')
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# Now do things legally
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softFunc('one', 'two', 'three')
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# or even
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softFunc('one', 'two', 'three', 'infinity')
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# softFunc handles arbitrary amount of arguments easily by virtue of * syntax
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# So using a single variable name in conjuction with * we gained the ability
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# to invoke a function with arbitrary amount of arguments.
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# Once again when softFunc is called the newly args
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# tuple filled with provided arguments is created
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# Conclusion softFunc is a more flexible/dynamic verson of a hardFunc
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``` |