The Python "close()" method is used to close an open file. It releases any system resources that were being used by the file. To close a file, you need to first open it using the "open()" function and then call the "close()" method on the file object.

Here's an example:

file = open("example.txt", "r")  # Open the file in read mode  
content = file.read()            # Read the contents of the file  
print(content)  
file.close()                     # Close the file  

In the example above, the "open()" function is used to open a file named "example.txt" in read mode. The file object is assigned to the variable "file". The "read()" method is then called to read the contents of the file and store them in the "content" variable. Finally, the "close()" method is called to close the file.