Introduction to Python functions: usage and examples of repr function

Introduction to Python functions: Usage and examples of repr function

Python is a high-level programming language widely used in various fields. It provides developers with many Powerful functions and methods. Among them, the repr function is one of the very useful functions, which can be used to return a string representation of an object.

In Python, the role of the repr function is to return a printable string form of an object, usually used for debugging and logging. It converts the object into a string form suitable for use or storage by the interpreter. This string form can be reconstructed through the eval function to obtain the original object.

The syntax of the repr function is very simple and has the following form:
repr(object)

The object parameter is the object that needs to be converted to a string.

Now, let's look at some specific examples and use the repr function to show how to use it.

Example 1: Use the repr function to return the string representation of an integer

num = 10
print(repr(num))  # 输出结果为 '10'

In this example, we use the repr function to convert the integer 10 to its string representation and print the result. . The output result is the string '10'.

Example 2: Use the repr function to return the string representation of a floating point number

f_num = 3.14159
print(repr(f_num))  # 输出结果为 '3.14159'

In this example, we use the repr function to convert the floating point number 3.14159 to its string representation and convert the result print it out. The output result is the string '3.14159'.

Example 3: Use the repr function to return the string representation of a string

string = "Hello, World!"
print(repr(string))  # 输出结果为 "'Hello, World!'"

In this example, we use the repr function to convert the string "Hello, World!" to its string representation representation and print out the result. The output result is the string "'Hello, World!'". Note that the string is wrapped in single quotes.

Example 4: Return the string representation of a list using the repr function

list_nums = [1, 2, 3, 4, 5]
print(repr(list_nums))  # 输出结果为 '[1, 2, 3, 4, 5]'

In this example, we use the repr function to convert the list [1, 2, 3, 4, 5] to it string representation and print the result. The output result is the string '[1, 2, 3, 4, 5]'. Note that in the list representation, the elements are enclosed in square brackets.

Example 5: Use the repr function to return the string representation of the dictionary

dict_nums = {'a': 1, 'b': 2, 'c': 3}
print(repr(dict_nums))  # 输出结果为 "{'a': 1, 'b': 2, 'c': 3}"

In this example, we use the repr function to return the dictionary {'a': 1, 'b': 2, ' c': 3} to its string representation and print the result. The output result is the string "{'a': 1, 'b': 2, 'c': 3}". Note that in the dictionary representation, the keys and values ​​are enclosed in curly braces and separated by colons.

Through the above examples, we can see the usage and effect of the repr function. It converts the object into a string representation suitable for printing and logging, and can re-deserialize the object via the eval function. This makes the repr function very useful when debugging and logging.

To summarize, the repr function in Python is a very useful function that returns a string representation of an object. It can convert various types of data into string representations suitable for printing and recording, and can reconstruct the original object through the eval function. In daily programming, we can use the repr function to perform string representation of objects that need to be recorded or debugged for easier viewing and analysis. I hope this article will help you understand and use the repr function!

The above is the detailed content of Introduction to Python functions: usage and examples of repr function. For more information, please follow other related articles on the PHP Chinese website!