如何在Python中找到一个数的除法余数呢?
例如: 如果这个数是26,整除数是7,那么整除余数是5。 (因为7+7+7=21,26-21=5。)
有关简单的可整除性测试,请参见如何检查一个数是否能被另一个数整除。
如何在Python中找到一个数的除法余数呢?
例如: 如果这个数是26,整除数是7,那么整除余数是5。 (因为7+7+7=21,26-21=5。)
有关简单的可整除性测试,请参见如何检查一个数是否能被另一个数整除。
当前回答
从Python 3.7开始,有一个新的math.remainder()函数:
from math import remainder
print(remainder(26,7))
输出:
-2.0 # not 5
注意,如上所述,它与%不同。
引用文档:
math.remainder(x, y) Return the IEEE 754-style remainder of x with respect to y. For finite x and finite nonzero y, this is the difference x - n*y, where n is the closest integer to the exact value of the quotient x / y. If x / y is exactly halfway between two consecutive integers, the nearest even integer is used for n. The remainder r = remainder(x, y) thus always satisfies abs(r) <= 0.5 * abs(y). Special cases follow IEEE 754: in particular, remainder(x, math.inf) is x for any finite x, and remainder(x, 0) and remainder(math.inf, x) raise ValueError for any non-NaN x. If the result of the remainder operation is zero, that zero will have the same sign as x. On platforms using IEEE 754 binary floating-point, the result of this operation is always exactly representable: no rounding error is introduced.
Issue29962描述了创建新函数的基本原理。
其他回答
除法时用%代替/。这将为您返回余数。所以在你的案例中
26 % 7 = 5
如果你想求除法问题的余数,就用实际的余数法则,就像数学一样。当然,这不会给你一个十进制输出。
valone = 8
valtwo = 3
x = valone / valtwo
r = valone - (valtwo * x)
print "Answer: %s with a remainder of %s" % (x, r)
如果你想用计算器的形式,只要代入valone = 8 用valone = int(输入(“值一”))。对valtwo = 3做同样的处理,但显然变量不同。
从Python 3.7开始,有一个新的math.remainder()函数:
from math import remainder
print(remainder(26,7))
输出:
-2.0 # not 5
注意,如上所述,它与%不同。
引用文档:
math.remainder(x, y) Return the IEEE 754-style remainder of x with respect to y. For finite x and finite nonzero y, this is the difference x - n*y, where n is the closest integer to the exact value of the quotient x / y. If x / y is exactly halfway between two consecutive integers, the nearest even integer is used for n. The remainder r = remainder(x, y) thus always satisfies abs(r) <= 0.5 * abs(y). Special cases follow IEEE 754: in particular, remainder(x, math.inf) is x for any finite x, and remainder(x, 0) and remainder(math.inf, x) raise ValueError for any non-NaN x. If the result of the remainder operation is zero, that zero will have the same sign as x. On platforms using IEEE 754 binary floating-point, the result of this operation is always exactly representable: no rounding error is introduced.
Issue29962描述了创建新函数的基本原理。
26 % 7(你将得到余数)
26 / 7(你会得到除数,可以是浮点值)
26 // 7(你将得到除数,只有整数值)
你正在寻找模运算符:
a % b
例如:
>>> 26 % 7
5
当然,也许他们希望您自己实现它,这也不会太难。