Add number in 001 format to file name in python

When working with files in Python, it is common to encounter situations where you need to add a number in a specific format to the file name. This can be useful for various purposes, such as creating a series of numbered files or organizing files in a specific order.

Option 1: Using string formatting

One way to solve this problem is by using string formatting in Python. You can use the built-in format() function to add the number in the desired format to the file name.

file_name = "file"
number = 1

formatted_file_name = "{}{:03d}".format(file_name, number)
print(formatted_file_name)

In this example, the file name is “file” and the number is 1. The {:03d} inside the format() function specifies that the number should be formatted as a three-digit number with leading zeros if necessary. The resulting file name will be “file001”.

Option 2: Using f-strings

Another way to solve this problem is by using f-strings, which were introduced in Python 3.6. F-strings provide a concise and readable way to format strings.

file_name = "file"
number = 1

formatted_file_name = f"{file_name}{number:03d}"
print(formatted_file_name)

In this example, the f-string {file_name}{number:03d} achieves the same result as the previous example. The resulting file name will also be “file001”.

Option 3: Using zfill()

A third option is to use the zfill() method, which is a built-in string method in Python. The zfill() method pads a string with zeros on the left until it reaches the specified width.

file_name = "file"
number = 1

formatted_file_name = file_name + str(number).zfill(3)
print(formatted_file_name)

In this example, the zfill(3) pads the number with zeros on the left until it reaches a width of three digits. The resulting file name will also be “file001”.

After considering these three options, the best approach depends on personal preference and the specific requirements of your project. String formatting and f-strings are both concise and readable, while the zfill() method provides a more explicit way to pad the number with zeros. Choose the option that suits your coding style and project needs.

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