# string 模块：字符串处理

In [1]:

```py
import string

```

标点符号：

In [2]:

```py
string.punctuation

```

Out[2]:

```py
'!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~'
```

字母表：

In [3]:

```py
print string.letters
print string.ascii_letters

```

```py
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ

```

小写和大写：

In [4]:

```py
print string.ascii_lowercase
print string.lowercase

print string.ascii_uppercase
print string.uppercase

```

```py
abcdefghijklmnopqrstuvwxyz
abcdefghijklmnopqrstuvwxyz
ABCDEFGHIJKLMNOPQRSTUVWXYZ
ABCDEFGHIJKLMNOPQRSTUVWXYZ

```

In [5]:

```py
print string.lower

```

```py
<function lower at 0x7efda4f2ae60>

```

数字：

In [6]:

```py
string.digits

```

Out[6]:

```py
'0123456789'
```

16 进制数字：

In [7]:

```py
string.hexdigits

```

Out[7]:

```py
'0123456789abcdefABCDEF'
```

每个单词的首字符大写：

In [8]:

```py
string.capwords("this is a big world")

```

Out[8]:

```py
'This Is A Big World'
```

将指定的单词放到中央：

In [9]:

```py
string.center("test", 20)

```

Out[9]:

```py
'        test        '
```