Looking for general feedback + a few small errors - python-3.x

Question

So as the title states I'm simply looking for general feedback on the overall structure of the script, where I could do better (don't have to tell me how, where would be plenty) and things like that. Any feedback, advice, tips or help in general is always greatly appreciated as I'm real keen to learn deeper!
As for the errors...
Errors:
It doesn't seem to save any of the contacts after closing, if the only method of saving it, to save it to a file?
Updating claims to be out of range, which if I'm correct it shouldn't be, unless I'm just not seeing something?
Not exactly an issue but something I've been playing with, with no good result...is it possible to have a for loop w/if statement in a comprehension format without being in a print statement?
My code so far:
"""
This is project that lets the user pretty much create and edit a contact book by giving them options and using their
input to complete the data needed for the contact book.
"""
import sys
contacts = []
lst = []
def ContactBook():
rows, cols = int(input("Please enter the amount of people you want in the contact book: ")), 5
print(contacts)
for i in range(rows):
print(f"All mandatory fields will include *")
for a in range(cols):
if a == 0:
lst.append(input("Enter a name*: "))
if lst[a] == '' or lst[a] == "": sys.exit(f"Failed to provide a name...Exiting the contact book!")
if a == 1: lst.append(input("Enter a number*: "))
if a == 2:
lst.append(input("Enter an email: "))
if lst[a] == '' or lst[a] == "": lst[a] = None
if a == 3:
lst.append(input("Enter a D.O.B (mm/dd/yy): "))
if lst[a] == '' or lst[a] == "": lst[a] = None
if a == 4:
lst.append(input("What category (Family/Friends/Work/Others): "))
if lst[a] == '' or lst[a] == "": lst[a] = None
contacts.append(lst)
print(f"Your contacts are:\n{contacts}")
return contacts
def Menu():
print(f"\t\t\t{'Contact Book':*^70}", flush=False)
print(f"Your options are:\n1. Add a Contact\n2. Searching Contacts\n3. Edit Contacts\n4. Delete Contacts\n"
f"5. View Contacts\n6. Delete Everything\n7. Exit the book")
choice = int(input("Please select an option: "))
return choice
def AddingContacts(cb):
for i in range(len(cb[0])):
if i == 0: contacts.append(input("Enter a name: "))
elif i == 1: contacts.append(int(input("Enter a number: ")))
elif i == 2: contacts.append(input("Enter a email: "))
elif i == 3: contacts.append(input("Enter a d.o.b (mm/dd/yy): "))
elif i == 4: contacts.append(input("Enter a category: "))
cb.append(contacts)
return cb
def SearchContacts(cb):
s = int(input("Select an option:\n1. Name\n2. Number\n3. Email\n4. D.O.B\n5. Category"))
t, c = [], -1
if s == 1:
q = input("Enter who you want to search: ")
for i in range(len(cb)):
if q == cb[i][0]: c = i, t.append(cb[i])
elif s == 2:
q = int(input("Enter the number you want to find: "))
for i in range(len(cb)):
if q == cb[i][1]: c = i, t.append(cb[i])
elif s == 3:
q = input("Enter the email you want to search: ")
for i in range(len(cb)):
if q == cb[i][2]: c = i, t.append(cb[i])
elif s == 4:
q = input("Enter the date you want to search in mm/dd/yy format: ")
for i in range(len(cb)):
if q == cb[i][3]: c = i, t.append(cb[i])
elif s == 5:
q = input("Enter a category you want to search: ")
for i in range(len(cb)):
if q == cb[i][4]: c = i, t.append(cb[i])
else:
print(f"Invalid search inquiry...")
return -1
if c == -1: return -1
elif c != -1:
ShowContent(t)
return c
def ShowContent(cb):
if not cb: print(f"List has nothing in it...: []")
else: print(f"{[cb[i] for i in range(len(cb))]}")
return cb
def UpdateContacts(cb):
for i in range(len(cb[0])):
if i == 0: contacts[0] = (input("Enter a name: "))
elif i == 1: contacts[1] = (int(input("Enter a number: ")))
elif i == 2: contacts[2] = (input("Enter a email: "))
elif i == 3: contacts[3] = (input("Enter a d.o.b: "))
elif i == 4: contacts[4] = (input("Enter a category: "))
cb.append(contacts)
return cb
def RemovingContacts(cb):
q = input("Enter the person you want to remove: ")
x = 0
for i in range(len(cb)):
if q == cb[i][0]: x += 1, print(f"This contact has now been removed: {cb.pop(i)}")
return cb
if x == 0: print(f"Person doesn't exist. Please check the name and try again....")
return cb
def DeleteBook(cb):
return cb.clear()
if __name__ == "__main__":
print(f"Welcome to your new Contact Book! Hope you find it easy to navigate!")
ch = 1
cb = ContactBook()
while ch in (1, 2, 3, 4, 5, 6):
ch = Menu()
if ch == 1: cb = AddingContacts(cb)
elif ch == 2: cb = SearchContacts(cb)
elif ch == 3: cb = UpdateContacts(cb)
elif ch == 4: cb = RemovingContacts(cb)
elif ch == 5: cb = ShowContent(cb)
elif ch == 6: cb = DeleteBook(cb)
else: sys.exit(f"Thank you for using this contact book! Have a great day!")
I plan on using the Pandas module to display the data in table format, is it possible without mySQL?