#Solved!
#Python SDK (python package) for Dropbox
#Problem
dbx.files_download_to_file(download_path="/downloads", path="/fileToDownload.txt")
#returns [Errno 13] Permission Denied
#Solution
#Omit "/" before directory path name
#download_path="downloads"
dbx.files_download_to_file(download_path="downloads", path="/fileToDownload.txt")
#end Solution section
#Download - Convert String to Bytes (search label references: convert text to bytes; str() to b''; string to b''; str() to b""; string to b"")
#Also; download returns bytes variable to save to file; however, you can decode it, to save the text as a string (python str() variable type), as follows:
metadata, variable_result = dbx.files_download(path='/fileToDownload.txt')
#bytes are returned as variable_result.content
#change them to a string, as follows:
variable_bytes = variable_result.content
variable_string = variable_bytes.decode("utf-8")
f = open("saveTextHere.txt", "x")
f.write(variable_string)
f.close()
#Upload - Convert Bytes to String (search label references: convert text to bytes; str() to bytes; str() to b''; str() to b""; string to b''; string to b"")
t = str("My text to save to upload file. Upload this text to user's Dropbox.com.")
b = t.encode('ascii')
f = '/newFileAtDropbox.txt'
dbx.files_upload(b, f)
#view your uploaded file; file location - Dropbox.com, folder: Dropbox/Apps/[appFolderName]
