import easygui
#Multi Enter Box
fieldNames1= ['Situation:(Example: Waiting for a friend who is late.)','Thoughts:(EXAMPLE: My friend Bob is always late!)','Emotions:(EXAMPLE: Mad & Stressed)','Behavior:(EXAMPLE: Arguing with family)']
#Write to file
file = open('Fieldnames test.txt', 'a')
file.write(repr(fieldNames1))
file.close()
Makes a file called "Fieldnames test.txt" with the following text regardless of what I input into "fieldnNames1".
['Situation:(Example: Waiting for a friend who is late.)', 'Thoughts:(EXAMPLE: My friend Bob is always late!)', 'Emotions:(EXAMPLE: Mad & Stressed)', 'Behavior:(EXAMPLE: Arguing with family)']
The problem is that calling repr() on the list will create a single string from the list. What you're wanting is something like:
f = open('output.txt', 'a')
f.write('\n'.join(fieldNames1))
f.close()
The write() method doesn't automatically create newlines, so you have join() the list of strings together using a newline that's appropriate for your platform (such as \n). You can read more about file objects over at the Python documentation.
Also, I recommend using a different variable than file, since file is actually a Python function. The code will work, but you should be aware of the potential for surprises.