Code Not Working Properly – Trying To Create A Simple Graph

I’m way too lazy to type in all that data everytime I run your script, so I automated that part to make development and testing of it easier. Likewise, I think the easiest thing to do would be to use the collections module’s defaultdict class to keep track of what dates have been seen and the total number of cases seen on each of them. Here’s what I mean:

from collections import defaultdict

#CoronaCaseNumber = input("")
#CoronaList = CoronaCaseNumber.split(" ")
#LuckyNumber = CoronaList[0]
#Date = CoronaList[1]
#Date2 = CoronaList[2]
LuckyNumber, Date, Date2 = "8 20200401 20200404".split(" ")

data = """\
HP4 20200402 1
HP5 20200402 1
HP1 20200401 1
HP2 20200401 1
HP3 20200401 1
HP6 20200403 0
HP6 20200404 1
HP7 20200404 1
""".splitlines()

LuckyNumero = int(LuckyNumber)
DateList = []
CaseNumberList = []
for case in range(LuckyNumero):
    CoronaCaseData = data[case]
    CoronaList2 = CoronaCaseData.split(" ")
    InfoDate = CoronaList2[1]
    DateList.append(InfoDate)
    CaseNumber = CoronaList2[2]
    CaseNumberList.append(CaseNumber)

DailyCases = defaultdict(int)

for i, d in enumerate(DateList):
    if Date <= d <= Date2:  # Valid date?
        DailyCases[d] += int(CaseNumberList[i])

# Print daily cases sorted by date (i.e. the dictionary's keys).
for date in sorted(DailyCases, key=lambda d: int(d)):
    print("{}:{}".format(date, '*' * DailyCases[date]))

Output:

20200401:***
20200402:**
20200403:
20200404:**