# 7.元组

元组可以理解为不可修改的列表。元组使用 () 定义，而非 \[].

```py
tup = (1,2,3)

# 当元组中只包含一个元素，应该加，.否则圆括号会被当作运算符使用
tup = (1)
print(type(tup))  # <class 'int'>

tup = (1,)
print(type(tup))  # <class 'tuple'>
```

## 元组操作

元组除了不可以修改，可以像列表一样，通过索引访问，截取，遍历

```py
tup = (1,2,3,4)

print(tup[0])

print(tup[0:-1])

for item in tup:
    print(item)
```

删除元组：

```py
# 元组不可以修改，但是可以通过del删除整个元组
tup = (1,2,3,4)
del tup
print(tup)

'''
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'tup' is not defined
'''
```

## 元组的函数

```py
len(tup)

max(tup)

min(tup)

# 将可迭代系列转换为元组
tuple(iterable)
```


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