Python's round() function: retain decimals with specified digits

Python's round() function: retains a specified number of decimal places, specific code examples are required

Overview:
In Python programming, it is often necessary to Points are rounded to the specified number of decimal places. To solve this problem, Python provides the round() function. This article will introduce the usage of the round() function and provide some specific code examples.

Usage of round() function:
The round() function is a built-in function in Python, used to round floating point numbers. The syntax is as follows:
round(number, digits)

Parameter description:

• number: The floating point number to be rounded.
• digits: Specify the number of decimal places to retain. The default is 0, which means rounding to an integer.

Return value:
The return value of the round() function is a floating point number, representing the rounded value.

Code examples:
The following are some specific code examples that demonstrate how to use the round() function to retain a specified number of decimal places.

Example 1: Reserve to two decimal places

num = 3.1415926
result = round(num, 2)
print(result)  # 输出3.14

Example 2: Reserve to one decimal place (default)

num = 3.1415926
result = round(num)
print(result)  # 输出3

Example 3: Reserve to three decimal places

num = 3.1415926
result = round(num, 3)
print(result)  # 输出3.142

Example 4: Rounding of negative numbers

num = -3.1415926
result = round(num, 2)
print(result)  # 输出-3.14

Example 5: Keeping integers (no decimal places)

num = 3.1415926
result = round(num, 0)
print(result)  # 输出3.0

Summary:
In Python programming, the round() function is a very convenient Tool for fast rounding of floating point numbers. By specifying the parameter digits, we can flexibly control the number of decimal places retained. Whether you want to keep integers, specify a number of decimal places, or round negative numbers, the round() function can meet our needs. Therefore, mastering the usage of the round() function is very important for daily data processing and output. I hope this article can help everyone and make everyone more comfortable in Python programming.

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