Check if file exists with python

here is a step-by-step tutorial on how to check if a file exists in python along with a code example:

### step 1: import the necessary module

### step 2: define a function to check file existence
you can define a function that takes the file path as an argument and returns `true` if the file exists, or `false` if it does not exist.

### step 3: use the function to check file existence
you can now call the `check_file_exists` function with the file path you want to check.

### full code example:

### explanation:
- we then call this function with a file path and print a message based on the result.

by following these steps and using the code example provided, you can easily check if a file exists in python.

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