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)
182 def handleClash1(userName, existing=[], prefix="", suffix=""):  argument
184 	existing should be a case-insensitive list
185 	of all existing file names.
189 	>>> existing = ["a" * 5]
191 	>>> e = list(existing)
192 	>>> handleClash1(userName="A" * 5, existing=e,
197 	>>> e = list(existing)
199 	>>> handleClash1(userName="A" * 5, existing=e,
204 	>>> e = list(existing)
206 	>>> handleClash1(userName="A" * 5, existing=e,
225 		if fullName.lower() not in existing:
234 		finalName = handleClash2(existing, prefix, suffix)
238 def handleClash2(existing=[], prefix="", suffix=""):  argument
240 	existing should be a case-insensitive list
241 	of all existing file names.
245 	>>> existing = [prefix + str(i) + suffix for i in range(100)]
247 	>>> e = list(existing)
248 	>>> handleClash2(existing=e, prefix=prefix, suffix=suffix) == (
252 	>>> e = list(existing)
254 	>>> handleClash2(existing=e, prefix=prefix, suffix=suffix) == (
258 	>>> e = list(existing)
260 	>>> handleClash2(existing=e, prefix=prefix, suffix=suffix) == (
272 		if fullName.lower() not in existing: