Chapter1-3

Question 1

Checking python version?

Answer 1

ust type python on command line , u will see the version

Question 2

How to start python on terminal?

Answer 2

start terminal
ii. Type python to start python
Write ur program

Question 3

best way to name python variable ?

Answer 3

2. The Python variables you’re using at this point should be lowercase. You won’t get errors if you use uppercase letters, but it’s a good idea to avoid using them for now.

Question 4

What is python traceback?

Answer 4

A traceback is a record of where the interpreter ran into trouble when trying to execute your code. e.g Traceback (most recent call last):
u File “hello_world.py”, line 2, in v print(mesage)
wNameError: name ‘mesage’ is not defined

Question 5

What does name error means?

Answer 5

A name error usually means we either forgot to set a variable’s value before using it, or we made a spelling mistake when entering the variable’s name.

Question 6

A string

Answer 6

you can use single or double quotes around strings

This exibility allows you to use quotes and apostrophes within your strings:

Question 7

whet is title() function?

Answer 7

title() function convert first letter if each word in string to capital

Question 8

how to strip whitespaces?

Answer 8

u strip whitespce using rstrip() e.g avorite_language = ‘python ‘ . favorite_language.rstrip() remove the whitespace after n

Question 9

lstrip()?

Answer 9

strip whitespace from the left side of a strin

Question 10

how to strip whitespace from both sides?

Answer 10

use strip()

Question 11

What is syntax error?

Answer 11

A syntax error: A syntax error occurs when Python doesn’t recognize a section of your pro- gram as valid Python code. For example, if you use an apostrophe within single quotes, you’ll produce an error.

Question 12

print in python 2 and 3 ? what is relation?

Answer 12

In python 2 , printing is not necessary u can type print “isa Musa”. In python 3 , some code u will see print with parenthesis some without parenthesis

Question 13

does python concatenate numbers with string?

Answer 13

Pyhon don’t concatinate numbers with string unless u change the numbers to string
error

Question 14

Integers in Python 2 ?

Answer 14

result to an integer
Division of integers in Python 2 results in an integer with the remainder truncated. Note that the result is not a rounded integer; the remainder is simply omitted.3/2 in python returen 1 make sure to use float

Question 15

How to comment in python?

Answer 15

Comments using #

Question 16

What is the zen of Python ?

Answer 16

Experienced Python programmers will encourage you to avoid com- plexity and aim for simplicity whenever possible. The Python community’s philosophy is contained in “The Zen of Python” by Tim Peters

Question 17

how to open zen of python?

Answer 17

You can access this brief set of principles for writing good Python code by enter- ing “import this” into your interpreter.

Question 18

what Is a list?

Answer 18

A list is a collection of items in a particular order. You can make a list that includes the letters of the alphabet, the digits from 0–9, or the names of all the people in your family. List items don’t have to be related in any order. Because a list usually contains more than one element, it’s a good idea to make the name of your list plural, such as letters, digits, or names.

Question 19

How to create a list?

Answer 19

In Python, square brackets ([]) indicate a list, and individual elements in the list are separated by commas bicycles = [‘trek’, ‘cannondale’, ‘redline’, ‘specialized’]

Question 20

how to access a List ?

Answer 20

Accessing Elements in a List A[0]

Question 21

where index position start in python?

Answer 21

Index Positions Start at 0, Not 1

Question 22

Accesing last item in list

Answer 22

1) A[-1] , we use -1 to access the last item in a list

Question 23

how negative list acess useful?

Answer 23

This syntax is quite useful, because you’ll often want to access the last items in a list without knowing exactly how long the list is. This convention extends to other negative index values as well. The index -2 returns the second item from the end of the list, the index -3 returns the third item from the end, and so forth.

Question 24

How to modify element in list?

Answer 24

motorcycles[0] = ‘ducati’

Question 25

How to addd element In a list?

Answer 25

The append() method makes it easy to build lists dynamically

Question 26

Example of adding item in list?

Answer 26

motorcycles = []

motorcycles. append(‘honda’)
motorcycles. append(‘yamaha’)
motorcycles. append(‘suzuki’

Building lists this way is very common, because you often won’t know the data your users want to store in a program until after the program is running. To put your users in control, start by de ning an empty list that will hold the users’ values. Then append each new value provided to the list you just created.

Question 27

How to Inserting Elements into a List ?

Answer 27

1) Insert method() is use to add element in a list
2) motorcycles = [‘honda’, ‘yamaha’, ‘suzuki’]
3) motorcycle.insert(0 , ‘musa’) …. This operation will push every other item to the right
4) result : [‘ducati’, ‘honda’, ‘yamaha’, ‘suzuki’]

Question 28

Removing Elements from a List

Answer 28

1) You can delete item from list if you know its position
2) We can use the keyword del to remove the element
3) E.g del motorcycles[0] .. This delete item at the first position

Question 29

How to remove an Item Using the pop() Method

Answer 29

Sometime u want use the position of an item u remove. For example u can assign it to inactive members. Pop() operation is useful in that sense

The pop() method removes the last item in a list, but it lets you work with that item after removing it. The term pop comes from thinking of a list as a stack of items and popping one item off the top of the stack .

Example of using pop()

Popped_motorcycle = motorcycle. Pop()

i. U can remove any item from any position using pop() by providing index
1) first_owned = motorcycles.pop(0)….. This removes an element at first position

Question 30

If you’re unsure whether to use the del statement or the pop() method what to do?

Answer 30

here’s a simple way to decide: when you want to delete an item from a list and not use that item in any way, use the del statement; if you want to use an item as you remove it, use the pop() method.

Question 31

How to remove item by value?

Answer 31

Sometimes you may need to remove an item from the list and you don’t know the position of the item , but you only know the value. You can use remove() methode to remove the item from the list

Example: motorcycles.remove(‘ducati’ ) This will remove ducati from the list motorcycle

The remove method , only removes the first occurance of an item. U need to use loop , to remove all the occurrence of the item u want remove.

Question 32

cars.sort() ?

Answer 32

sorting function

Question 33

cars.sort(reverse=True) ?

Answer 33

ii. cars.sort(reverse=True) ………..sorting in reverse order

Question 34

What is differ between sort() and sorted()

Answer 34

Sort() function sort data permaently. Sorted() function sort temporarily, it does not affect the original list

Question 35

What reverse() does?

Answer 35

v. reverse() method is a method that can be use to reverse the element in a list. Th reverse method as well reverse the order of the list permanently , but you can reverse it back , by using reverse() function again on the list

Question 36

What is IndexError:

Answer 36

list index out of range