Introduction and Variables and Data Types

Question 1

What is the difference between compiled and interpreted languages?

Answer 1

Compiled Languages
1. Code is sent to compiler
2. Compiler translates entire program into code compatible with with target or host machine (Machine Code)
3. Target executes code and return output

Interpreted languages
1. Code read by an interpreter
2. Interpreter returns output without creating executable machine code as independent artifact

Question 2

What is JupyterLab?

Answer 2

• Integrated development environment
• Facilitates robust development of large Python projects

Question 3

What is Anaconda?

Answer 3

• Popular distribution packet of Python
• Machine learning and Data sciene

Question 4

How to access help on functions? Give example with the print function.

Answer 4

help(print())

Question 5

How do you start interpreter?

Answer 5

Typing:

python

in the interpreter

Question 6

Explain what a interpreter is

Answer 6

• Program that reads and executes Python code
• Parsing, compiling, and interpreting

Question 7

Which naming rules exist for variables in python?

Answer 7

Do´s
* Start with letter or underscore

Dont´s
* Existing Variable names
* Reserved words (print, def)

Question 8

What is wrong $weight = 73 ? And which Error would Occur?

Answer 8

• Invalid Syntax error
• Must start with underscore or letter

Question 9

Which python style naming conventions are there for naming variables?

Answer 9

• All lowercase
• Words separated by underscores

Question 10

What is the assignment operator and how does he works?

Answer 10

• (=) sign is called an assignment operator
• Assigns value from right-to-left.

Question 11

What are literals?

Answer 11

• Numbers
• Have the value that they literally and explicitly should have (in this case, 73)
• Cannot be redefined with a different value

Question 12

How would you scientificaly notate
4.5 x 10^7 ? Explain syientific notation and give an example.

Answer 12

• Represent very large or small numbers
• Commonly used in scientific and engineering fields

4.5e7

Question 13

How are imaginary numbers represented in Python?

Answer 13

• Build in data type:
  ~~~
  complex
  ~~~
  ```
  complex_number = 1+6J
  ~~~

Question 14

Write down a hexadecimal

Answer 14

0xFF

• 0x followed by hex part

Question 15

Write down an Octal

Answer 15

0o23
* Zero followed by lower case o

Question 16

What is the remainder of:
~~~
15 % 6
~~~

Answer 16

3

Question 17

Define String

Answer 17

• Stores text
• In (“”)
• Series of characters (numbers, letters, exclamation etc.)

Question 18

Is a string mutable?

Answer 18

• Immutable

Mitigation:
* Assign text to new string

Question 19

Explain why you cant put certain characters in strings and show example of how to mitigate

Answer 19

• Mitigate characters in string that have special meaning in syntax ( “, n, \, r, t)

Escape Characters ()
Escape Sequence (")

Example:

string = "Hello \"Bob\". You count.
output = "Hello "Bob". You Count

Question 20

How would you ignore an escaped string? Explain and write down example

Answer 20

• Raw String
• String prefixed with an r or R
• Tells python to treat strings literally

raw_string = r"This ignores "Bob is \"sad\""

output: "This ignores "Bob is \"sad\""

Question 21

Demonstrate how to get the index – i.e. the position of a character within a string.

Answer 21

my_string = "Hello, World!"
print(my_string.index('e'))

output: 1

Question 22

Demostrate how to count number of matching characters in string

Answer 22

my_string = "Hello, World!"
my_string.count('o')

output: 2

Question 23

Demonstrate two ways on concatenating strings

Answer 23

string_one = "Hello"
string_two = "World"

string_three = string_one + string_two

format_string = "Other way {} is {}".format(string_one, other string="like That")

Question 24

Demostrate how How to replicate the string greeting = "Hello" 4 times? -

Answer 24

print(greeting*4)

Question 25

Demonstrate the use of all substring operations using all three operators with the example string Hello

Answer 25

The first operator indicates start. Without additional parameters, it will only return character.

example_string = "Hello"
print(example_string[1])

output: e

The second character is (:). It indicates the end. Left without third parameter, it will output the rest of string

print(example_string[1:]
output: llo

print(example_string[1:3]
output: ll

The third parameter in the substring operation is the step. The step allows you to specify an increment that identifies characters to be returned in the substring. Think of it as “return every xth character.”

print(example_string[0::2]

output: hlo

print(exampe_string[0::4]

output: l

Question 26

Demonstrate how to insert a string between every letter of another string

Answer 26

print(("-").join("TEST"))

output: T-E-S-T

Question 27

Demostrate how to split a string in its components and return list. Explain the method you use

Answer 27

print("This is a String".split(" "))

The .split(“ “) method is called on the string. The split() method is used to divide a string into a list of substrings based on a specified delimiter. In this case, the delimiter is a space character “ “.

Question 28

Demonstrate how to replace a character or substring within a string with another character or substring

Answer 28

print("Python is amazin".replace("is", "grüfti"))

output: Python is grüfti

Question 29

Demonstrate how you would put quotes into a string in Python

Answer 29

my_string = “this has \”quotes\”.”