Question

using python3

Write a Python program that lets a user search through the 'data.txt' file for a given first name, last name, or email address, and print all the matches/results.

• Prompt the user for which field to search, (f) for first name, (l) for last name, or (e) for email
  • data.txt entries are all formatted as: first_name, last_name, email, separated by TABS
• Your program should not read the entire file into memory, it should read line by line, and only keep/save lines that match the search.
• Your program should ignore case (e.g. 'eric' and 'Eric' are the same name)
• When finished, your program should print out all the search results, in a table format.

Test your program.

Answer 1

query=input('Enter which files to search, (f) for first name, (l) for last name, or (e) for email:')
if query.lower()=='f':
    search=input('Enter a first name to search: ')
elif query.lower()=='l':
    search=input('Enter a last name to search: ')
else:
    search=input('Enter an email to search: ')
file='data.txt'
dataLines=[]
with open(file,'r') as f:
    for line in f:
        tokens=line.strip().split('\t')
        if query.lower()=='f':
            if search.lower()==tokens[0].lower():
                dataLines.append(tokens)
        elif query.lower()=='l':
            if search.lower()==tokens[1].lower():
                dataLines.append(tokens)
        else:
            if search.lower()==tokens[2].lower():
                dataLines.append(tokens)
print('Search results: ')
print('{:^20}{:^20}{:>30}'.format('first name','last name','email'))
for i in dataLines:
    print('{:^20}{:^20}{:>30}'.format(i[0],i[1],i[2]))