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22.34 Lab 12 B FALL 2019 Python File I/O demo Overview This is a demonstration of...

22.34 Lab 12 B FALL 2019 Python File I/O demo

Overview

This is a demonstration of File IO

Description

Read in a list of states from a file, and output those states in alphabetical order.

Provided input files

A single input file named states.txt is provided that lists the 50 states of the United States - one state per row. Some states have lowercase letters, where some begin with uppercase letters. As a reminder, lowercase letters come after uppercase letters alphabetically. The states are in a random order. The file has the following format:

Michigan
Alaska
New Mexico
Alabama
Nevada
...

Objectives

Write the following in main.py:

Open the states.txt file.
Create a list called ‘states’ where each element in the list is one of the states read from the file.
Print to the user (not to a file) an alphabetized list of all the states, with one state per line. For example,

Alabama
Alaska
Arizona
...

Solutions

Expert Solution

The file is created as states.txt name.

states.txt -

Michigan

Alaska

New Mexico

Alabama

Nevada

Montana

Nebraska

New Hampshire

New Jersey

minnesota

arkansas

california

colorado

connecticut

delaware

florida

georgia

hawaii

idaho

illinois

indiana

iowa

kansas

kentucky

louisiana

maine

maryland

massachusetts

michigan

mississippi

montana

New York

North Carolina

North Dakota

Ohio

Oklahoma

Oregon

Pennsylvania

Rhode Island

South Carolina

South Dakota

Tennessee

Texas

Utah

Vermont

Virginia

Washington

West Virginia

Wisconsin

Wyoming

missouri

nevada

new Hampshire

new Jersey

arizona

new York

north Carolina

north Dakota

ohio

nebraska

west Virginia

oregon

pennsylvania

rhode Island

south Carolina

oklahoma

south Dakota

tennessee

texas

utah

vermont

virginia

washington

new Mexico

wisconsin

wyoming

alabama

alaska

Arizona

Arkansas

California

Colorado

Connecticut

Delaware

Florida

Georgia

Hawaii

Idaho

Illinois

Indiana

Iowa

Kansas

Kentucky

Louisiana

Maine

Maryland

Massachusetts

Minnesota

Mississippi

Missouri

Then, in the program, a list is created with the name states.

All the content from the text file is printed to the user.

Program –

main.py –

states = []
# an empty list to store the name of the states

# opening a tetx file
with open("states.txt") as f:
    for ff in f:
        # takiing the elements from the text file to the list
        states.append(ff)
    
    # sorting the list    
    states = sorted(states)
    
    # displaying the name of the states
    for i in states:
        print(i)

Sample output –

Explanation –

An empty list states is created.
A states.txt file is opened.
In the loop, the append() method is used to add the content from the file to the list.
A sorted() method is used to sort the list.
Finally, the list is printed to the user with the loop.

venereology answered 3 months ago

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