Intro To Python

Question 1

What are Strings?

Answer 1

Strings are primitive data type of the python language. You can think of a data type as a building block of a language. The content inside the print function is a string.(“word here”)

Question 2

What are Booleans?

Answer 2

Boolean assess the truth of something. Boolean values are either true are false. Example: 5>7 is 5 greater than 7? = false, 7<5 is 5 smaller than 7? = true

Question 3

Conditional Logic

Answer 3

Comparison operator, Meaning
<            Less than
<=          Less than or equal to
>            greater than
>=          greater than or equal to
==          equal
!=           not equal

Question 4

What is numpy?

Answer 4

¹

Question 5

True or Flase statement?
Num = 3
Is number > 10
Print(num)

Answer 5

True

Question 6

Logical Operators?

Answer 6

And, or, not 
Can be used in conjunction with conditional logic ex:
Num = 4
print(num > 0 and num < 15)
Output: true

Question 7

The 3 main file types and the functions to load them?

Answer 7

.csv files - pd.read_csv(‘filepath’)
.xlsx files - pd.read_excel(‘filepath’)
‘Filepath’ can be remote URL if it points to .csv or.xlsx file

Question 8

What is df.info()

Answer 8

To get lots of info in, including data type, index, and column names

Question 9

What is df.dtypes

Answer 9

To get just the data type for just all column

Question 10

What us df.[‘name’].dtypes

Answer 10

To get the data type for just one column

Question 11

What is df.head()

Answer 11

This will give you the top 5 rows

Question 12

What us df.head(8)

Answer 12

To see a different number of rows such as the first 8 rows

Question 13

What is df.tail()

Answer 13

To see the bottom 5 rows

Question 14

What is df.tail(11)

Answer 14

To see a different number of rows such as the last 11 rows

Question 15

What is df.sample(5)

Answer 15

To see 5 random rows

Question 16

What are functions?

Answer 16

The syntax

Question 17

How is list used?

Answer 17

z = [3, 7, 4, 2]
index 0 1 2 3
Neg index -4 -3 -2 -1

Question 18

What does Slicing Dataframes mean?

Answer 18

Selecting specific colums

Question 19

what is df.[‘name’]

Answer 19

To select 1 column as a pandas series

Question 20

What is df[[‘name’]]

Answer 20

To select 1 column as a pandas dataframe

Question 21

What is df[[‘name’, ‘manufacturer’]]

Answer 21

To select multiple columns as a dataframe

Question 22

What is df.info()

Answer 22

To get lots of info including data type, index, and column names

Question 23

What is df.shape

Answer 23

To get the shape(rows, columns)

Question 24

What is Len(df)

Answer 24

To get the number of rows

Question 25

What is len(df.columns)

Answer 25

To get the number of columns

Question 26

What is a else statement?

Answer 26

Must be after an if or elif statement . There can be at most one else statement. Will only execute if all the "if" and "elif" statement above it are false

Question 27

What's elif statement?

Answer 27

"elif" is the shortened code for "else if". Must be after an if statement

Question 28

If, elif and else statements in use for catchfall condition

Answer 28

``` Num = 5 if num > 50: print('num is larger than 50') elif num == 21: print('num = 21') else: print('catchfall condition') ```

Question 29

What is a list?

Answer 29

An ordered collection of items which can be of different types. Lists are mutable

Question 30

What is a float?

Answer 30

A number that is not a whole number, example: 0.25 or 1/2

Question 31

What is an integer?

Answer 31

A whole number inside a list

Question 32

How to perform exponentiation?

Answer 32

By using two asterisks, example: 2**5

Question 33

Quotient, what is a floor division?

Answer 33

Done by using two forward slashes and is used to determine the quotient of a division, example: print(20//6) Output: 3, because 6 goes into 20 three times

Question 34

What is a modular operator?

Answer 34

A % symbol used to get the remainder of a division. Example: print(20%6) Output-

Question 35

What does Newlines- \n represent?

Answer 35

It can be used to create multi-line output, example: print('one\nTwo\nThree')

Question 36

What is stack?

Answer 36

Tacking is a Last-in-First-out (LIFO) principle. The last item you out in, is the first you you take out

Question 37

What is queue?

Answer 37

Like the name suggests, follow the First-in-First-out (FIFO) principle. First item that was put in is the first item taken out