95 def userNameToFileName(userName: str, existing=(), prefix="", suffix=""):  argument
97     `existing` should be a set-like object.
177     if fullName.lower() in existing:
178         fullName = handleClash1(userName, existing, prefix, suffix)
183 def handleClash1(userName, existing=[], prefix="", suffix=""):  argument
185     existing should be a case-insensitive list
186     of all existing file names.
190     >>> existing = ["a" * 5]
192     >>> e = list(existing)
193     >>> handleClash1(userName="A" * 5, existing=e,
198     >>> e = list(existing)
200     >>> handleClash1(userName="A" * 5, existing=e,
205     >>> e = list(existing)
207     >>> handleClash1(userName="A" * 5, existing=e,
226         if fullName.lower() not in existing:
235         finalName = handleClash2(existing, prefix, suffix)
240 def handleClash2(existing=[], prefix="", suffix=""):  argument
242     existing should be a case-insensitive list
243     of all existing file names.
247     >>> existing = [prefix + str(i) + suffix for i in range(100)]
249     >>> e = list(existing)
250     >>> handleClash2(existing=e, prefix=prefix, suffix=suffix) == (
254     >>> e = list(existing)
256     >>> handleClash2(existing=e, prefix=prefix, suffix=suffix) == (
260     >>> e = list(existing)
262     >>> handleClash2(existing=e, prefix=prefix, suffix=suffix) == (
274         if fullName.lower() not in existing: