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fix the format and typo #119

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fix the format and typo #119

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46 changes: 23 additions & 23 deletions Article/PythonBasis/python6/3.md
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Original file line number Diff line number Diff line change
Expand Up @@ -26,10 +26,10 @@
```python
# -*- coding: UTF-8 -*-

def print_user_info( name , age , sex = '男' ):
def print_user_info( name , age , sex='男' ):
# 打印用户信息
print('昵称：{}'.format(name) , end = ' ')
print('年龄：{}'.format(age) , end = ' ')
print('昵称：{}'.format(name) , end=' ')
print('年龄：{}'.format(age) , end=' ')
print('性别：{}'.format(sex))
return;

Expand All @@ -54,7 +54,7 @@ print_user_info( '三点水' , 25 )

默认值参数就这样结束了吗？

还没有的，细想一下，如果参数中是一个可修改的容器比如一个 lsit （列表）或者 dict （字典），那么我们使用什么来作为默认值呢？
还没有的，细想一下，如果参数中是一个可修改的容器比如一个 list （列表）或者 dict （字典），那么我们使用什么来作为默认值呢？

我们可以使用 None 作为默认值。就像下面这个例子一样：

Expand Down Expand Up @@ -87,7 +87,7 @@ def print_info( a , b = [] ):
```python
# -*- coding: UTF-8 -*-

def print_info( a , b = [] ):
def print_info( a , b=[] ):
print(b)
return b ;

Expand Down Expand Up @@ -115,7 +115,7 @@ print_info(2)
```python
_no_value =object()

def print_info( a , b = _no_value ):
def print_info( a , b=_no_value ):
if b is _no_value :
print('b 没有赋值')
return;
Expand Down Expand Up @@ -143,17 +143,17 @@ def print_info( a , b = _no_value ):
```python
# -*- coding: UTF-8 -*-

def print_user_info( name , age , sex = '男' ):
def print_user_info( name , age , sex='男' ):
# 打印用户信息
print('昵称：{}'.format(name) , end = ' ')
print('年龄：{}'.format(age) , end = ' ')
print('昵称：{}'.format(name) , end=' ')
print('年龄：{}'.format(age) , end=' ')
print('性别：{}'.format(sex))
return;

# 调用 print_user_info 函数

print_user_info( name = '两点水' ,age = 18 , sex = '女')
print_user_info( name = '两点水' ,sex = '女', age = 18 )
print_user_info( name = '两点水' ,age=18 , sex='女')
print_user_info( name = '两点水' ,sex='女', age=18 )

```

Expand Down Expand Up @@ -183,11 +183,11 @@ Python 提供了一种元组的方式来接受没有直接定义的参数。这
```python
# -*- coding: UTF-8 -*-

def print_user_info( name , age , sex = '男' , * hobby):
def print_user_info( name , age , sex='男' , * hobby):
# 打印用户信息
print('昵称：{}'.format(name) , end = ' ')
print('年龄：{}'.format(age) , end = ' ')
print('性别：{}'.format(sex) ,end = ' ' )
print('昵称：{}'.format(name) , end=' ')
print('年龄：{}'.format(age) , end=' ')
print('性别：{}'.format(sex) ,end=' ' )
print('爱好：{}'.format(hobby))
return;

Expand All @@ -213,11 +213,11 @@ print_user_info( '两点水' ,18 , '女', '打篮球','打羽毛球','跑步')
```python
# -*- coding: UTF-8 -*-

def print_user_info( name , age , sex = '男' , ** hobby ):
def print_user_info( name , age , sex='男' , ** hobby ):
# 打印用户信息
print('昵称：{}'.format(name) , end = ' ')
print('年龄：{}'.format(age) , end = ' ')
print('性别：{}'.format(sex) ,end = ' ' )
print('昵称：{}'.format(name) , end=' ')
print('年龄：{}'.format(age) , end=' ')
print('性别：{}'.format(sex) ,end=' ' )
print('爱好：{}'.format(hobby))
return;

Expand Down Expand Up @@ -245,15 +245,15 @@ print_user_info( name = '两点水' , age = 18 , sex = '女', hobby = ('打篮
```python
# -*- coding: UTF-8 -*-

def print_user_info( name , *, age , sex = '男' ):
def print_user_info( name , *, age , sex='男' ):
# 打印用户信息
print('昵称：{}'.format(name) , end = ' ')
print('年龄：{}'.format(age) , end = ' ')
print('昵称：{}'.format(name) , end=' ')
print('年龄：{}'.format(age) , end=' ')
print('性别：{}'.format(sex))
return;

# 调用 print_user_info 函数
print_user_info( name = '两点水' ,age = 18 , sex = '女' )
print_user_info( name = '两点水' ,age=18 , sex='女' )

# 这种写法会报错，因为 age ，sex 这两个参数强制使用关键字参数
#print_user_info( '两点水' , 18 , '女' )
Expand Down