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Invert (rekey) a file / Python
this example from a Well House Consultants training course
Source code: pee3.py Module: G908
"""
This is an example program that "rekeys" a file. Each line of data contains a person's name and the programming languages they know. And the task is to list out the file programming language by programming language, with a list of the names of the people alongside each language. This example is written in Python. We also provide examples in Perl and Ruby for comparison. """ # Empty list (rz) and dictionary (langtab) for storing results as we read file rz = [] langtab = {} # traverse the file for lyne in open("../data/requests.xyz").xreadlines(): # remove the new line, split the line, and pull the name off the start of the array parts = lyne.strip().split(" ") name = parts[0] parts = parts[1:] # iterate through each language this person knows for lang in parts: # We're also save a list of who knows PHP! if lang == "PHP": rz.append(name) # store the name into the language hash, creating a new element if you need to if not langtab.get(lang): langtab[lang] = [name] else: langtab[lang] += [name] # Report people who know PHP rz = ", ".join(rz) print "People who know PHP:", rz # Report all the languages covered print "Languages covered: ", ", ".join(langtab.keys()) # Report by language all the people who know each llist = langtab.keys() llist.sort() for lang in llist: print lang,", ".join(langtab[lang]) """ # Sample output munchkin:februb grahamellis$ ruby pee3 People who know PHP: antonia, delia, florence, hazel, leane, olivia, rita, uva, xena, zoe, barry, ed, harry, john, morris, nigel, peter, quentin, steve, ulsyees, william, xavier, yuri Languages covered: Tcl/Tk, XML, PHP, Java, Ruby, MySQL, Perl, Python, ASP ASP barbara, delia, ethel, florence, hazel, jenny, leane, nina, olivia, petra, queenie, rita, venus, wendy, xena, zoe Java barbara, cherry, delia, florence, iris, leane, tina, uva, venus, xena, barry, david, ed, fred, graham, harry, ivan, john, ken, len, morris, nigel, peter, rupert, tommy, ulsyees, xavier, zachary MySQL antonia, cherry, ethel, gloria, iris, kerry, margaret, olivia, queenie, sally, uva, wendy, yollanda, adam, charles, fred, ivan, len, orpheus, rupert, victor, zachary PHP antonia, delia, florence, hazel, leane, olivia, rita, uva, xena, zoe, barry, ed, harry, john, morris, nigel, peter, quentin, steve, ulsyees, william, xavier, yuri Perl antonia, cherry, ethel, gloria, hazel, iris, jenny, kerry, leane, margaret, nina, petra, queenie, rita, sally, uva, venus, wendy, xena, zoe, adam, barry, charles, david, ed, fred, graham, ivan, john, ken, len, morris, nigel, peter, quentin, steve, tommy, ulsyees, victor, william, xavier, yuri Python hazel, leane, olivia, adam, barry, harry, ken, nigel, rupert Ruby barbara, cherry, florence, hazel, jenny, kerry, margaret, nina, petra, queenie, rita, tina, venus, yollanda, zoe, charles, ed, ivan, len, orpheus, quentin, steve, victor, william Tcl/Tk antonia, barbara, ethel, gloria, iris, kerry, margaret, nina, petra, sally, tina, wendy, yollanda, adam, charles, david, graham, ivan, ken, morris, orpheus, quentin, steve, victor, yuri, zachary XML antonia, delia, gloria, jenny, margaret, petra, sally, xena, barry, fred, john, orpheus, tommy, yuri munchkin:februb grahamellis$ """ Learn about this subject
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