python sum

Python sum() function is used to get the sum of numbers of an iterable.

Python sum（）函数用于获取可迭代数的总和。

Python sum（） (Python sum())

Python sum() function syntax is:

Python sum（）函数语法为：

sum(iterable[, start])

start is an optional number with default value of 0. If start is provided, then the sum of start and all the numbers in the iterable is returned.

start是一个可选数字，默认值为0。如果提供了start，则将返回start和可迭代对象中所有数字的总和。

Python sum（）数字列表 (Python sum() list of numbers)

s = sum([1, 2, 3])
print(s)s = sum([1, 2, 3], 10)
print(s)

Output:

输出：

6
16

Note that sum() method doesn’t take keyword arguments, so if we write sum([1, 2, 3], start=10) then it will throw exception as TypeError: sum() takes no keyword arguments.

请注意，sum（）方法不带关键字参数，因此，如果我们编写sum([1, 2, 3], start=10) ，它将抛出异常，因为TypeError: sum() takes no keyword arguments 。

Python整数序列的总和 (Python sum of a sequence of integers)

Since sum accepts iterable as argument, we can pass tuple, bytes of numbers too.

由于sum接受iterable作为参数，因此我们也可以传递tuple ，数字字节。

s = sum(bytes([1, 2]))
print(s)s = sum(bytearray([1, 2]), 10)
print(s)# sum of integers in different formats, tuple of numbers
s = sum((1, 0b11, 0o17, 0xFF))
print(s)s = sum((1, 0b11, 0o17, 0xFF), 0xF)
print(s)

Output:

输出：

3
13
274
289

Python的浮点数总和 (Python sum of floats)

s = sum([1.5, 2.5, 3])
print(s)

Output: 7.0

输出： 7.0

If you want to add floating point values with extended precision, you can use math.fsum() function.

如果要添加扩展精度的浮点值，则可以使用math.fsum()函数。

Python的复数和 (Python sum of complex numbers)

sum() function works with complex numbers too.

sum（）函数也适用于复数。

s = sum([1 + 2j, 3 + 4j])
print(s)s = sum([1 + 2j, 3 + 4j], 2 + 2j)
print(s)s = sum([1 + 2j, 2, 1.5 - 2j])
print(s)

Output:

输出：

(4+6j)
(6+8j)
(4.5+0j)

Reference: Official Documentation

参考： 官方文档

翻译自: https://www.journaldev.com/23147/python-sum

python sum