python精确定时

处理精度 (Handling precisions)

There are many ways to handle/set the precision with a float value, some of the math functions and some of them are based on the formatting.

有很多方法可以使用浮点值来处理/设置精度，其中一些数学函数，其中一些基于格式。

Example without handling precision

没有精确度的示例

# Python program to print float valueimport matha = 10.123456789b = 10.0c = 10.134d = 10 / 3print("Without precision handling...")print("a:", a)print("b:", b)print("c:", c)print("d:", d)

Output

输出量

Without precision handling...a: 10.123456789b: 10.0c: 10.134d: 3.3333333333333335

1)处理精度的方法 (1) Methods to handle the precision )

• It is used to get the truncated integer value of a number, it accepts a number (either an integer or a float) and returns the real value truncated to an integral.

  它用于获取数字的截断整数值，它接受数字(整数或浮点数)，然后将截断后的实数值返回为整数。

• It is used to get the ceil value of a given number, it accepts a number/numeric expression and returns the smallest integral value which is greater than the number.

  它用于获取给定数字的ceil值，它接受数字/数字表达式并返回大于该数字的最小整数值。

• It is used to get the floor value of a given number, it is used to get the floor value of a number, it accepts a number/numeric expression and returns largest integer (integral) value, which is not greater than the number.

  它用于获取给定数字的下限值，用于获取数字的下限值，它接受数字/数字表达式，并返回不大于该数字的最大整数(整数)值。

Python program for precision handing using trunc(), ceil() and floor() methods

使用trunc()，ceil()和floor()方法进行精确处理的Python程序

# Python program for precision handing using # trunc(), ceil() and floor() methodsimport matha = 10.123456789b = 10.0c = 10.134d = 10 / 3print("Without precision handling...")print("a:", a)print("b:", b)print("c:", c)print("d:", d)# using trunc() methodprint("Using trunc() method...")print("math.trunc(a): ", math.trunc(a))print("math.trunc(b): ", math.trunc(b))print("math.trunc(c): ", math.trunc(c))print("math.trunc(d): ", math.trunc(d))# using ceil() methodprint("Using ceil() method...")print("math.ceil(a): ", math.ceil(a))print("math.ceil(b): ", math.ceil(b))print("math.ceil(c): ", math.ceil(c))print("math.ceil(d): ", math.ceil(d))# using floor() methodprint("Using floor() method...")print("math.floor(a): ", math.floor(a))print("math.floor(b): ", math.floor(b))print("math.floor(c): ", math.floor(c))print("math.floor(d): ", math.floor(d))

Output

输出量

Without precision handling... a: 10.123456789b: 10.0  c: 10.134d: 3.3333333333333335Using trunc() method... math.trunc(a):  10math.trunc(b):  10math.trunc(c):  10math.trunc(d):  3 Using ceil() method...  math.ceil(a):  11 math.ceil(b):  10 math.ceil(c):  11 math.ceil(d):  4  Using floor() method... math.floor(a):  10math.floor(b):  10math.floor(c):  10math.floor(d):  3

2)使用不同的格式化方式处理精度 (2) Handing precision using different ways of formatting )

• Using "%"

  使用“％”

  This method is similar to “printf() function in C language”, it is used to format as well as set the precision.

  此方法类似于“ C语言中的printf()函数”，用于设置格式和设置精度。

• Using format() method

  使用format()方法

  This method is used to format a string and we can define the number of precision.

  此方法用于格式化字符串，我们可以定义精度数。

• Using round() method

  使用round()方法

  This method rounds the float value with given number of precisions.

  此方法以给定的精度舍入浮点值。

Python program for precision handing using %, format() and round() methods

使用％，format()和round()方法进行精度处理的Python程序

# Python program for precision handing# using % , format() and round() methodsa = 10.123456789b = 10.0c = 10.134d = 10 / 3print("Without precision handling...")print("a:", a)print("b:", b)print("c:", c)print("d:", d)print("Using %...")print("%.2f" % a)print("%.2f" % b)print("%.2f" % c)print("%.2f" % d)print("Using format()...")print("{0:.2f}".format(a))print("{0:.2f}".format(b))print("{0:.2f}".format(c))print("{0:.2f}".format(d))print("Using round()...")print(round(a, 2))print(round(b, 2))print(round(c, 2))print(round(d, 2))

Output

输出量

Without precision handling...a: 10.123456789b: 10.0c: 10.134d: 3.3333333333333335Using %...10.1210.0010.133.33Using format()...10.1210.0010.133.33Using round()...10.1210.0 10.133.33

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python精确定时