95 lines
1.4 KiB
Markdown
95 lines
1.4 KiB
Markdown
### 函数定义与参数
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- def定义
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```python
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def my_function(fname):
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print(fname + " Gates")
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my_function("Bill")
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my_function("Steve")
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my_function("Elon")
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```
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- 默认参数
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```python
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def my_function(country = "China"):
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print("I am from " + country)
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my_function()
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my_function("Brazil")
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```
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- 关键字参数：使用key=value形式传递参数，顺序不严格要求
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```python
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def my_function(child3, child2, child1):
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print("The youngest child is " + child3)
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my_function(child1 = "Phoebe", child2 = "Jennifer", child3 = "Rory")
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```
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- 任意参数：相当于多个参数元组
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```python
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def my_function(*kids):
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print("The youngest child is " + kids[2])
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my_function("Phoebe", "Jennifer", "Rory")
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```
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- pass语句
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```python
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def myfunction:
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pass
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```
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### 函数返回值 return
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- 返回两个参数，分别接收
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```python
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>>> def myfunc():
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... return 1,2
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...
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>>> a, b = myfunc()
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>>> a
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1
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>>> b
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2
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>>>
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```
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- 返回两个结果，一个变量接收
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```python
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>>> def myfunc():
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... return 1,2
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...
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>>> a= myfunc()
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>>> a
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(1, 2)
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>>>
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```
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- 返回值元组形式，多个变量接收，接收变量数超出返回值数量会报错
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```python
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>>> def myfunc():
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... return (1,2)
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...
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>>> a, b = myfunc()
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>>> a
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1
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>>> b
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2
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>>> a, b, c = myfunc()
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Traceback (most recent call last):
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File "<stdin>", line 1, in <module>
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ValueError: not enough values to unpack (expected 3, got 2)
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>>>
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```
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