Every time I try to create a new script or file, I get an error saying "The new file/project couldn't be created. Please make sure that you entered a valid file name." Am I the only one who gets this error? I'm using an iPad Mini4 with ios9.0.2.
Is your device jailbroken? Some jailbreak "hiding" tools can cause this issue with Pythonista. If you have one, try disabling it and see if that helps - Pythonista works fine on jailbroken devices in general. (Note: I don't have a jailbreak myself, I'm basically repeating what other people have said in the past.)