Why is the code not entering the if statement?

In this code, I wanted to make a dictionary that would contain the encrypted version of a string. however, at the first if statement, the code seems to skip over both if statements and do not understand why

8   import string
9   
10  
11  drunk="abcdefABC"
12  joe={}
13  shift=4
14  for i in drunk:
15      for j in string.ascii_lowercase:
16          listj=[]
17          listj.append(j)
18      for x in string.ascii_uppercase:
19          listx=[]
20          listx.append(x)
21      if i in listj:
22          tempvara=ord(i)
23          tempvarb=chr(tempvara+shift)
24          joe[i]=tempvarb
25      if i in listx:
26          vartempa=i.lower()
27          vartempb=ord(i)
28          vartempc=chr(vartempb+shift)
29          vartempc=vartempc.upper()
30          joe[i]=vartempc
31  print(Joe)

Coded in Python