How To Use Python Program To Calculate The Average Of Numbers In A Given List

This example will tell you how to calculate a list of number’s average values in python.

1. Use Python To Calculate Average Number Of A Number List Example1.

```# This function is used to calculate the average number of a list number.
def calculate_average_number_in_list(list):

# If the list object is not none.
if list:

# Used to save summarize value of the number list value.
sum = 0.0

# Number type list element counter.
number_type_element_count = 0

# Loop in the list object.
for value in list:

# If the list element is a number.
if is_number(value):

# Number type list element counter plus 1.
number_type_element_count = number_type_element_count + 1

# Convert the value to a float number.
float_number = float(value)

# Add the number to the summarize value.
sum = sum + float_number

# Calculate the average number value of the number list.
average_number = sum / number_type_element_count

print('Average number of list : ')

print(list)

print('is')

print(average_number)

''' check whether the value can be converted to a float number value.
If the value is a string and contains no digit value, then it can not be converted to a float number.'''
def is_number(value):

ret = True
try:
float_value = float(value)
print('\'' + value + '\' is a number.')
except:
print('\'' + value + '\' is not a number.')
ret = False
finally:
return ret

if __name__ == '__main__':

# Create a list with number and none number string.
list = [1,2,3,4,5,"6",7,8.1,'abc','10']

calculate_average_number_in_list(list)
```

Before is the above source code execution result.

```'6' is a number.
'abc' is not a number.
'10' is a number.
Average number of list :
[1, 2, 3, 4, 5, '6', 7, 8.1, 'abc', '10']
is
5.122222222222223
```

2. Calculate User Input Number List Average Value In Python.

```from builtins import input

''' check whether the value can be converted to a float number value.
If the value is a string and contains no digit value, then it can not be converted to a float number.'''
def is_number(value):

ret = True
try:
float_value = float(value)
print('\'' + value + '\' is a number.')
except:
print('\'' + value + '\' is not a number.')
ret = False
finally:
return ret

def calculate_user_input_number_list():

number_count = eval(input("How many numbers in the list?"))

sum = 0

for i in range(number_count):

x = eval(input("Enter a number : "))

if is_number(x):

sum = sum + float(x)

else:

print("Your input value\' " + x +"\' is not a number, program exit. ")

return

average_value = sum / number_count

# str(average_value) will avoid the TypeError: can only concatenate str (not "float") to str.
print("\nThe average valur is: " + str(average_value))

if __name__ == '__main__':

calculate_user_input_number_list()
```

Below is the above source code execution result.

```How many numbers in the list?3
Enter a number : 89
Enter a number : 63
Enter a number : 98

The average valur is: 83.33333333333333```

If your input is not a number type, then it will show the below output in the console.

```How many numbers in the list?3
Enter a number: 1
Enter a number: "6"
'6' is a number.
Enter a number: "abc"
'abc' is not a number.
Your input value 'abc' is not a number, program exit.```

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