Python中的 abs()

Python abs()函数用于返回一个数字的绝对值，即去除数字的负号。

Syntax: abs(number)
number: Can be an integer, a floating-point

number or a complex number

编程需要懂一点英语

abs() 只接受一个参数，即要返回其绝对值的数字。参数可以是整数、浮点数或复数。

如果参数是整数或浮点数，abs() 以整数或浮点数返回绝对值。
在复数的情况下， abs() 仅返回幅度部分，也可以是浮点数。

Python中的 abs()函数有什么作用？

abs()函数将任何负数变为正数，而正数不受影响。任何数的绝对值总是正的。对于任何正数，绝对值是数字本身，对于任何负数，绝对值是 (-1) 乘以负数。

示例 1： Python abs()函数示例

在这个例子中，我们将浮点、整数和复数数据传递给 abs()函数，它将返回绝对值。

Python3

# Python code to illustrate
# abs() built-in function
 
# floating point number
float = -54.26
print('Absolute value of float is:', abs(float))
 
# An integer
int = -94
print('Absolute value of integer is:', abs(int))
 
# A complex number
complex = (3 - 4j)
print('Absolute value or Magnitude of complex is:', abs(complex))

Python3

# Python3 Program to calculate speed,
# distance and time
 
# Function to calculate speed
def cal_speed(dist, time):
    print(" Distance(km) :", dist)
    print(" Time(hr) :", time)
    return dist / time
 
# Function to calculate distance traveled
def cal_dis(speed, time):
    print(" Time(hr) :", time)
    print(" Speed(km / hr) :", speed)
    return speed * time
 
# Function to calculate time taken
def cal_time(dist, speed):
    print(" Distance(km) :", dist)
    print(" Speed(km / hr) :", speed)
    return speed * dist
 
# Driver Code
# Calling function cal_speed()
print(" The calculated Speed(km / hr) is :",
      cal_speed(abs(45.9), abs(2.0)))
print("")
 
# Calling function cal_dis()
print(" The calculated Distance(km) :",
      cal_dis(abs(62.9), abs(2.5)))
print("")
 
# Calling function cal_time()
print(" The calculated Time(hr) :",
      cal_time(abs(48.0), abs(4.5)))

输出：

Absolute value of float is: 54.26
Absolute value of integer is: 94
Absolute value or Magnitude of complex is: 5.0

例子2：绝对值Python，距离计算

这个等式显示了速度、行驶距离和所用时间之间的关系：

Speed is distance divided by the time taken.

编程需要懂一点英语

而且我们知道速度、时间和距离永远不会是负数，为此我们将使用 abs() 方法来计算准确的时间、距离和速度。

使用的公式：

Distance  = Speed * Time
Time = Distance / Speed
Speed = Distance / Time

例子：

Input : distance(km) : 48.5  time(hr) : 2.6
Output : Speed(km / hr) : 18.653846153

Input : speed(km / hr) : 46.0  time(hr) : 3.2
Output : Distance(km) : 147.2

Input : distance(km) : 48.5  speed(km / hr) : 46.0
Output : Time(hr) : 1.0543

代码：

Python3

# Python3 Program to calculate speed,
# distance and time
 
# Function to calculate speed
def cal_speed(dist, time):
    print(" Distance(km) :", dist)
    print(" Time(hr) :", time)
    return dist / time
 
# Function to calculate distance traveled
def cal_dis(speed, time):
    print(" Time(hr) :", time)
    print(" Speed(km / hr) :", speed)
    return speed * time
 
# Function to calculate time taken
def cal_time(dist, speed):
    print(" Distance(km) :", dist)
    print(" Speed(km / hr) :", speed)
    return speed * dist
 
# Driver Code
# Calling function cal_speed()
print(" The calculated Speed(km / hr) is :",
      cal_speed(abs(45.9), abs(2.0)))
print("")
 
# Calling function cal_dis()
print(" The calculated Distance(km) :",
      cal_dis(abs(62.9), abs(2.5)))
print("")
 
# Calling function cal_time()
print(" The calculated Time(hr) :",
      cal_time(abs(48.0), abs(4.5)))

输出：

Distance(km) : 45.9
 Time(hr) : 2.0
 The calculated Speed(km / hr) is : 22.95

 Time(hr) : 2.5
 Speed(km / hr) : 62.9
 The calculated Distance(km) : 157.25

 Distance(km) : 48.0
 Speed(km / hr) : 4.5
 The calculated Time(hr) : 216.0