CS50 Library for Python

Installation

pip3 install cs50

Usage

import cs50

...

f = cs50.get_float();
i = cs50.get_int();
s = cs50.get_string();

Testing

1. Run cli50 in python-cs50.
2. Run sudo su -.
3. Run apt install -y libmysqlclient-dev mysql-server postgresql.
4. Run pip3 install mysqlclient psycopg2-binary.
5. In /etc/mysql/mysql.conf.d/mysqld.cnf, add skip-grant-tables under [mysqld].
6. In /etc/profile.d/cli.sh, remove valgrind function for now.
7. Run service mysql start.
8. Run mysql -e 'CREATE DATABASE IF NOT EXISTS test;'.
9. In `/etc/postgresql/10/main/pg_hba.conf, change:

   local   all             postgres                                peer
   host    all             all             127.0.0.1/32            md5
   

   to:

   local   all             postgres                                trust
   host    all             all             127.0.0.1/32            trust
   

10. Run service postgresql start.
11. Run psql -c 'create database test;' -U postgres.

Sample Tests

import cs50
db = cs50.SQL("sqlite:///foo.db")
db.execute("CREATE TABLE IF NOT EXISTS cs50 (id INTEGER PRIMARY KEY, val TEXT, bin BLOB)")
db.execute("INSERT INTO cs50 (val) VALUES('a')")
db.execute("INSERT INTO cs50 (val) VALUES('b')")
db.execute("BEGIN")
db.execute("INSERT INTO cs50 (val) VALUES('c')")
db.execute("INSERT INTO cs50 (val) VALUES('x')")
db.execute("INSERT INTO cs50 (val) VALUES('y')")
db.execute("ROLLBACK")
db.execute("INSERT INTO cs50 (val) VALUES('z')")
db.execute("COMMIT")

---

import cs50
db = cs50.SQL("mysql://root@localhost/test")
db.execute("CREATE TABLE IF NOT EXISTS cs50 (id INTEGER PRIMARY KEY, val TEXT, bin BLOB)")
db.execute("INSERT INTO cs50 (val) VALUES('a')")
db.execute("INSERT INTO cs50 (val) VALUES('b')")
db.execute("BEGIN")
db.execute("INSERT INTO cs50 (val) VALUES('c')")
db.execute("INSERT INTO cs50 (val) VALUES('x')")
db.execute("INSERT INTO cs50 (val) VALUES('y')")
db.execute("ROLLBACK")
db.execute("INSERT INTO cs50 (val) VALUES('z')")
db.execute("COMMIT")

---

import cs50
db = cs50.SQL("postgresql://postgres@localhost/test")
db.execute("CREATE TABLE IF NOT EXISTS cs50 (id SERIAL PRIMARY KEY, val VARCHAR(16), bin BYTEA)")
db.execute("INSERT INTO cs50 (val) VALUES('a')")
db.execute("INSERT INTO cs50 (val) VALUES('b')")
db.execute("BEGIN")
db.execute("INSERT INTO cs50 (val) VALUES('c')")
db.execute("INSERT INTO cs50 (val) VALUES('x')")
db.execute("INSERT INTO cs50 (val) VALUES('y')")
db.execute("ROLLBACK")
db.execute("INSERT INTO cs50 (val) VALUES('z')")
db.execute("COMMIT")