Python sum() function

內置的 Python sum() Functions are another powerful tool,whenever you are there Python processing digital data.sum() The first argument to the function should be a collection of numbers you want to add up.These values ​​can be contained in a list、元組、集合或字典中.與sum()The optional second argument used with the function is 'start'參數.This will add a numerical value to the final result.如果你試圖用 sum() Use a non-numeric data type,Python 將拋出一個錯誤.現在讓我們看看sum()A few examples of how it works.

with a list of integers sum()

The first example shows a list of integers stored in a variable.We can pass that variable to sum()函數,It adds them all up and returns the result to us.

list_of_ints = [1, 9, 4, 6, 7, 7, 2]
the_sum = sum(list_of_ints)
print(the_sum)
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36
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with a list of floatssum()

example twosum()There is a list of floats.Again we pass the list of floats to sum()函數,It gives us results faster than we can do in our heads.

list_of_floats = [1.5, 9.2, 4.9, 6.1, 7.8, 7.7, 2.1234]
the_sum = sum(list_of_floats)
print(the_sum)
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39.32340000000001
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with a list of integers and an optional startsum()函數

Example threesum()does use optionalstart參數.We can see that we are adding1+1,當然是2,但是由於我們使用了10的起點,So the end result is actually12.

list_of_ints = [1, 1]
the_sum = sum(list_of_ints, start=10)
print(the_sum)
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12
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with integer groupssum()函數

例四：sum()The function adds all integer values ​​stored in a tuple.

tuple_of_ints = (2, 4, 10)
the_sum = sum(tuple_of_ints)
print(the_sum)
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16
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A tuple of floatssum()

在sum()Example 5 of the function,We add up some floats stored in a tuple.

tuple_of_floats = (2.55, 4.123, 10.987)
the_sum = sum(tuple_of_floats)
print(the_sum)
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17.66
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A tuple with integers and an optional starting numbersum()

Example 6 shows how to use itsum()with a tuple of integers and optionalstart參數.

tuple_of_ints = (2, 4, 10)
the_sum = sum(tuple_of_ints, start=20)
print(the_sum)
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36
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with a set sum()

Example 7 is very interesting,Because we are using a collectionsum()函數.The result below will be2+2+4The result after adding is 6.This is because the set removes duplicates before completing the sum operation 2.

set_of_ints = {2, 2, 4}
the_sum = sum(set_of_ints)
print(the_sum)
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6
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帶有字典的 sum()

我們可以看一下 sum() The last example of a function,It is the sum of the keys in a dictionary.

the_dict = {5: 'The contents in 5',
7: 'What is stored in seven',
2: 'One more value'}
result = sum(the_dict)
print(result)
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14
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如果你想在 Python Sums all values ​​of a dictionary in ,你可以這樣做.

the_dict = {'a': 2, 'b': 4, 'c': 6}
result = sum(the_dict.values())
print(result)
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12
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