python dictionary example

student_portal.py

# >>> d={"adventurous":"aventurero","bold":"audaz","courageous":"valiente"} 
# >>>d.items()
# [('courageous', 'valiente'), ('adventurous', 'aventurero'), ('bold', 'audaz')]
# >>> d.keys()
# ['courageous', 'adventurous', 'bold']
# >>> d.values()
# ['valiente', 'aventurero', 'audaz']
# >>> my_list = [('a', 1), ('b', 2)]
# >>> dict(my_list)
# {'a': 1, 'b': 2}


# TODO: runtime and time complexity issue!!! make the code simple!

def makelst(A):
    avglist = []
    for key in A.keys():
        avglist.append(float(A[key]["avg"]))
    return avglist

def sortavglst(avglist):
    n = len(avglist)
    for i in range(n):
        for j in range(0, n-i-1):
            if avglist[j] > avglist[j+1] :
                avglist[j], avglist[j+1] = avglist[j+1], avglist[j]
    return avglist
    

def createRATE(avgsortedlst, A):
    for key in A.keys():
        for i in range(len(avgsortedlst)):
            if A[key]["avg"] == avgsortedlst[i]:
                A[key]["rate"] = i+1

def calAVG(A):
    for key in A.keys():
        s = 0
        for i in A[key]["course_info"]:
            s+= float(i[1])
            avg = s/len(A[key]["course_info"])
            A[key]["avg"] = avg

def fillMe():
    A = {}
    for i in range(int(input("[+] REGISTERING FOR ? >>> "))):
        A[int(input("[+] STU ID >>> "))] = {"name": str(input("[+] NAME >>> ")), 
           "lname": str(input("[+] LASTNAME >>> ")),
           "avg": None,
           "rate": None,
           "course_info": [tuple(input("[+] WRITE COURSE NAME->MARK >>> ").split("->")) for cname in range(int(input("[+] COURSE NUMBER ? >>> ")))]
           }

    return A

def printMe(A):
    print("\n\n")
    for key in A.keys():
        print("STUID =========\n")
        print("{}\n".format(A[key]))
        print("FIRSTNAME ========\n")
        print("{}\n".format(A[key]["name"]))
        print("LASTNAME ========\n")
        print("{}\n".format(A[key]["lname"]))
        print("AVERAGE ========\n")
        print("{}\n".format(A[key]["avg"]))
        print("RATE ========\n")
        print("{}\n".format(A[key]["rate"]))
        print("COURSE INFO =========\n")
        for i in A[key]["course_info"]:
            print("{} -> {}".format(i[0], i[1]))
        print("\n")

if __name__ =="__main__":
    A = fillMe()
    calAVG(A)
    createRATE(sortavglst(makelst(A)), A)
    printMe(A)

# =====================================
# multi same dict key and their values

# METHOD 1
class Dictlist(dict):
    def __setitem__(self, key, value):
        try:
            self[key]
        except KeyError:
            super(Dictlist, self).__setitem__(key, [])
        self[key].append(value)

d = dictlist.Dictlist()
d['test'] = 1
d['test'] = 2
d['test'] = 3
# >>> d
# {'test': [1, 2, 3]}
d['other'] = 100
# >>> d
# {'test': [1, 2, 3], 'other': [100]}

# METHOD 2
class DictList(dict):
    def __setitem__(self, key, value):
        try:
            # Assumes there is a list on the key
            self[key].append(value) 
        except KeyError: # if fails because there is no key
            super(DictList, self).__setitem__(key, value)
        except AttributeError: # if fails because it is not a list
            super(DictList, self).__setitem__(key, [self[key], value])

dl = DictList()
dl['a'] = 1
dl['b'] = 2
dl['b'] = 3


# OUTPUT: {'a': 1, 'b': [2, 3]}