Intro To Python Flashcards
What are Strings?
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”)
What are Booleans?
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
Conditional Logic
Comparison operator, Meaning < Less than <= Less than or equal to > greater than >= greater than or equal to == equal != not equal
What is numpy?
¹
True or Flase statement?
Num = 3
Is number > 10
Print(num)
True
Logical Operators?
And, or, not Can be used in conjunction with conditional logic ex: Num = 4 print(num > 0 and num < 15) Output: true
The 3 main file types and the functions to load them?
.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
What is df.info()
To get lots of info in, including data type, index, and column names
What is df.dtypes
To get just the data type for just all column
What us df.[‘name’].dtypes
To get the data type for just one column
What is df.head()
This will give you the top 5 rows
What us df.head(8)
To see a different number of rows such as the first 8 rows
What is df.tail()
To see the bottom 5 rows
What is df.tail(11)
To see a different number of rows such as the last 11 rows
What is df.sample(5)
To see 5 random rows
What are functions?
The syntax
How is list used?
z = [3, 7, 4, 2]
index 0 1 2 3
Neg index -4 -3 -2 -1
What does Slicing Dataframes mean?
Selecting specific colums
what is df.[‘name’]
To select 1 column as a pandas series
What is df[[‘name’]]
To select 1 column as a pandas dataframe
What is df[[‘name’, ‘manufacturer’]]
To select multiple columns as a dataframe
What is df.info()
To get lots of info including data type, index, and column names
What is df.shape
To get the shape(rows, columns)
What is Len(df)
To get the number of rows
What is len(df.columns)
To get the number of columns
What is a else statement?
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
What’s elif statement?
“elif” is the shortened code for “else if”. Must be after an if statement
If, elif and else statements in use for catchfall condition
Num = 5
if num > 50:
print('num is larger than 50')
elif num == 21:
print('num = 21')
else:
print('catchfall condition')What is a list?
An ordered collection of items which can be of different types. Lists are mutable
What is a float?
A number that is not a whole number, example: 0.25 or 1/2
What is an integer?
A whole number inside a list
How to perform exponentiation?
By using two asterisks, example: 2**5
Quotient, what is a floor division?
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
What is a modular operator?
A % symbol used to get the remainder of a division. Example: print(20%6) Output-
What does Newlines- \n represent?
It can be used to create multi-line output, example: print(‘one\nTwo\nThree’)
What is stack?
Tacking is a Last-in-First-out (LIFO) principle. The last item you out in, is the first you you take out
What is queue?
Like the name suggests, follow the First-in-First-out (FIFO) principle. First item that was put in is the first item taken out
