Define the function mean_val(dict_arg) that returns the average of all the values in dict_arg.
时间: 2024-05-10 13:15:26 浏览: 10
Here is a possible implementation of the mean_val() function in Python:
```python
def mean_val(dict_arg):
values = list(dict_arg.values())
return sum(values) / len(values) if values else 0
```
The function takes a dictionary as input and extracts its values into a list. It then returns the average of the values using the sum() and len() functions. If the dictionary is empty, the function returns 0 to avoid a division by zero error.
相关问题
Define the function in_dict(dict_arg, value) that returns a boolean True if value exists in dict_arg and False if the value is not in dict_arg.
Here's a sample implementation of the `in_dict` function in Python:
```python
def in_dict(dict_arg, value):
"""
Checks if a value exists in a dictionary.
Args:
dict_arg: A dictionary to search for the value.
value: The value to search for in the dictionary.
Returns:
True if the value exists in the dictionary, False otherwise.
"""
if value in dict_arg.values():
return True
else:
return False
```
This function takes two arguments: `dict_arg`, which is the dictionary to search in, and `value`, which is the value to search for in the dictionary.
The function uses the `values()` method of the dictionary to get a list of all the values in the dictionary, and then checks if the `value` argument is in that list. If it is, the function returns `True`. Otherwise, it returns `False`.
Define a function first_last(list1) that returns a list with the first and last element of list1 interchanged.
Here's the Python code for the function `first_last(list1)` that returns a list with the first and last element of `list1` interchanged:
```python
def first_last(list1):
if len(list1) < 2:
return list1
else:
first = list1[0]
last = list1[-1]
list1[0] = last
list1[-1] = first
return list1
```
This function takes in a list `list1` as its input and first checks if the length of the list is less than 2. If the length is less than 2, it simply returns the original list. Otherwise, it stores the first element of the list in a variable called `first` and the last element of the list in a variable called `last`. It then interchanges the values of `first` and `last` in the list and returns the modified list.