filename = r'c:\users\fox\desktop\test\speech_data\ + text + .wav' in python

To create a file name dynamically using a string variable and concatenation, you can use f-string. Here's an example:

main.py
text = "example_text"
filename = f'c:\\users\\fox\\desktop\\test\\speech_data\\{text}.wav'
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Alternatively, you can also use .format() method to pass variable values into a string:

main.py
text = "example_text"
filename = 'c:\\users\\fox\\desktop\\test\\speech_data\\{}.wav'.format(text)
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Both methods will result in the same file path:

main.py
c:\users\fox\desktop\test\speech_data\example_text.wav
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Note that since the backslash is a special character in Python strings, you need to escape it with another backslash. This is why there are two backslashes in the file path.