Introduction to Python functions: Introduction and examples of int functions

Introduction to Python functions: introduction and examples of int functions

Python is a powerful programming language that is widely used in data analysis, artificial intelligence, web development, etc. field. Python has many built-in functions. This article will introduce a commonly used function in Python - int, and provide specific examples.

1. Int function

The int function is a built-in function in Python, used to convert a string or floating point number into an integer. Normally, when Python interprets an integer string, it automatically converts it to an integer; when it interprets a floating-point string, it automatically converts it to a floating-point number. However, when we need to explicitly convert a string or floating point number to an integer, we need to use the int function.

2. Examples of int functions

The following are some examples of int functions to help readers better understand the usage and functions of int functions.

1. Convert string to integer

Code example:

n = "55"
x = int(n)
print(x)

Output result:

55

In the above code, we First, a string variable n is defined, whose value is "55". Subsequently, we use the int function to convert n to an integer and assign it to the variable x. Finally, we use the print function to output the value of x, and the result is 55.

2. Convert a number with a decimal point to an integer

Code example:

n = 39.8
x = int(n)
print(x)

Output result:

39

In the above code , we first define a floating point variable n with a value of 39.8. Subsequently, we use the int function to convert n to an integer and assign it to the variable x. It should be noted that since the int function rounds down, 39.8 will be converted to 39. Finally, we use the print function to output the value of x, and the result is 39.

3. Customize the base number for conversion

Code example:

n = "FF"
x = int(n, 16)
print(x)

Output result:

255

In the above code, We first define a hexadecimal string n with the value "FF". Subsequently, we use the int function to convert n to a decimal integer and assign it to the variable x. It should be noted that since the decimal number corresponding to FF is 255, the final output result is 255.

4. Handling exceptions

When using the int function, sometimes you encounter a string or floating point number that cannot be converted, and Python will throw a ValueError exception. . We can use try-except statement to handle this exception situation.

Code example:

n = "hello"
try:
  x = int(n)
  print(x)
except ValueError:
  print("无法将%s转换为整数" % n)

Output result:

无法将hello转换为整数

In the above code, we first define a string variable n, whose value is "hello". We then use a try-except statement to try to convert n to an integer and assign it to the variable x. Since "hello" cannot be converted to an integer, Python throws a ValueError exception. In the except statement, we output a prompt message telling the user that "hello" cannot be converted to an integer.

Summary:

The int function is a commonly used built-in function in Python, which can convert a string or floating point number into an integer. When using the int function, you need to pay attention to the issue of base numbers. At the same time, we can also use the try-except statement to handle situations where conversion cannot be performed.

This article provides multiple examples, hoping to help readers better master the use of int functions.

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