PYTHON CODES

PYTHON CODES

 

 A statement or expression is an instruction the computer will run or execute.

The value in the parentheses is called the argument.

A Semantic error is when your logic is wrong.

print("Hello\nWorld!")

Hello

World!

Expressions describe a type of operation that computers perform.

1. We can bind a string to another variable.
2. It is helpful to think of string as a list or tuple.

`We can treat the string as a sequence and perform sequence operations.

We can also input a stride value as follows. The 2 indicates we select every second variable.

1. we set the variable A to the following value.
2. We apply the method "upper" and set it equal to "B“.

1. The method find, finds sub-strings. The argument is the sub-string you would like
2. to find. The output is the first index of the sequence.
3. We can find the sub-string Jack. If the sub-string is not in the string, the
4. output is negative one.

MODULE 2

lists and tuples, these are called compound data types

Tuples Tuples are an ordered sequence.

Sort data to analyze it

Managing Your Data

What is a database?

Almost every data scientist will spend time working in a database, which is an organized collection of structured data in a computer system. (Remember, structured data is usually organized in a table format with rows and columns, like the following example.)

Last four digits of social security number	Last name	Age
6881	Marshall	23
0121	Rodriguez	19
5538	Cho	59
2972	Parker	33
3154	Sawyer	72

Most databases today are organized as relational databases, which are collections of multiple data sets or tables that link together.

While SQL is the underlying language that drives most work done in relational databases, there are many RDBMSs in which you can do that work. As you venture into this field, you’ll run into names like these:

• MySQL
• Microsoft Access
• PostgreSQL
• Oracle
• IBM DB2
• MongoDB

Choose the right tools to manage data

Where do you begin? There are dozens of useful data science tools and platforms! Here’s a list of some popular and open source platforms that you can use to begin your own data science journey.

R is a good place to start

R is a programming language and free software environment often used for statistical analysis and data science. Many would-be data scientists start with this tool or with one of the popular R interfaces, and there are hundreds of useful packages in R that help with data visualization such as ggplot2.

Python works for general purposes

Python is a popular, general-purpose programming language that can also be used for data science. Pair it with a library like pandas library and with a useful interface, and Python can help you create new insights and data visualizations.

MATLAB helps crunch numbers

MATLAB was built to focus on numerical computing. It is often used in higher education.

Apache Spark supports big data and machine learning

Apache Spark is a proprietary general-purpose framework that can be especially useful for extremely large data sets and the machine learning that uses them.