Python Text Basics

Question 1

What are F String Literals ?

Answer 1

Format String Literals , are used to format strings in print method.

Question 2

How to present dictionary value by using F String ?

Answer 2

d = {‘a’:123,’b’:456}

print(f”My No. is - {d[‘a’]}”)

Question 3

How to present list value by using F String ?

Answer 3

mylist = [0,1,2,3]

print(f”My No. is - {mylist[0]}”)

Question 4

How to create Tuple ?

Answer 4

myFruits = (‘Apple’,’Banana’,’Grapes’)

Question 5

How to create List of Tuples ?

Answer 5

books = [(‘Author’,’Title’,’Pages’),(‘Twain’,’Rafting’,601),(‘Hamilton’,’Mythology’,144)]

Question 6

*IMP

How to unpack tuples from List ?

Answer 6

books = [(‘Author’,’Title’,’Pages’),(‘Twain’,’Rafting’,601),(‘Hamilton’,’Mythology’,144)]+

for author,title,pages in books:
print(f”{author} {title} {pages}”)

Question 7

How to fit numerical value with string in f string ?

Answer 7

profiles = [(‘Name’,’Age’),(‘Hemant Kumar ‘,40)]
for name,age in profiles:
print(f”{name:

Question 8

How to set the padding between output of two variables with fstring ?

Answer 8

name = ‘Hemant Kumar’
age = 32
print(f”{name:{10}} {age:{5}}”)

Question 9

*IMP

How to Print line with variable output using fstring ?

Answer 9

name = ‘Hemant Kumar’
age = 32
print(f”{name:-{5}}”)

Question 10

How to Create a Data time Object?

Answer 10

from datetime import datetime

today = datetime(year=2019,month=2,day=28)

Question 11

What is the website which gives reference to format time ?

Answer 11

The website is strtime.org

Question 12

How to format date object with print method ?

Answer 12

from datetime import datetime
today = datetime(year=2019,month=2,day=28)
print(f”{today:%B %d,%Y}”)

B for Full Month
d for Day
Y for Full Year

Question 13

How to create text file in Jupiter Notebook ?

Answer 13

%%writefile test.txt
Hello, this is test file,
This is second line

Question 14

How to get current Absolute Path ?

Answer 14

using pwd

Question 15

How to create a file object to read/write a file ?

Answer 15

We have to use open() method .

myfile = open(‘test.txt’)

Question 16

File name in Python ,Windows, Linux, MacOS

Answer 16

We have to use double backslash in Windows, & forward slash in Linuc/MacOS

Windows :
‘C:\Users\cs1\MEGAsync\PythonCoding
Linux : /home/hemant/

Question 17

How to read a text file ?

Answer 17

myfile.read()

Question 18

What happens if we read text files by two times ?

myfile. read()
myfile. read()

Answer 18

I we read file first time , the curson goes to end of file , & we read file second time it shows nothing, because cursor is in the end of file .

Question 19

How to move file cursor at index position zero or at beginning of file?

Answer 19

myfile.seek(0)

Question 20

How to save content of file in variable ?

Answer 20

content = myfile.read()

print(content)

Question 21

What are literals in python?

Answer 21

Literals are the constant values assigned to the constant variables

Question 22

How to close a text file ?

Answer 22

myfile.close()

Question 23

How to create a list of lines from text file ?

Answer 23

myfile = open('test.txt')
mylines = myfile.readlines()
for line in mylines:
    print(line)
myfile.close()

Question 24

How to split/fetch first word from lines

in text file ?

Answer 24

myfile = open('test.txt')
mylines = myfile.readlines()
for line in mylines:
    print(line.split()[0])
myfile.close()

Question 25

How to present first char of each line from text file ?

Answer 25

myfile = open('test.txt')
mylines = myfile.readlines()
for line in mylines:
    print(line[0])
myfile.close()

Question 26

What is the default mode of file open method() ?

Answer 26

The default mode is read mode ?

Question 27

How to to get descriptive help in Jupyter Notebook Cell while typing a Code ?

Answer 27

Use keyboard shortcut shift + tab , or shift + double tab for more decription

Question 28

How to open text file for writing & reading ?

Answer 28

We have to pass w+ parameter to open() method in quotes.

myfile = open(‘test.txt’,’w+’)

Question 29

What are the precautions while using w+ parameter ?

Answer 29

It deletes the existing contents of file ?

Question 30

How to open a file with append mode ?

Answer 30

We have to use a+ parameter .
myfile = open('test1.txt','a+') 
or myfile = open('test1.txt', 'mode='a+')
myfile.write('\nThis is second line')
myfile.close()
myfile.read()

Question 31

How to append to new line ?

Answer 31

myfile = open('test1.txt',mode='a+')
myfile.write('\nThis is second line')
myfile.close()
myfile =open('test1.txt')
print(myfile.read())

Question 32

What is context manager, & we use it?

Answer 32

we use with keyword as context manager which automatically closes the file

with open('test1.txt',mode='r') as mynewfile:
    lines=mynewfile.readlines()
for line in lines:
    print(line)

Question 33

Which Library is used for pdf files ?

Answer 33

PyPDF2

Question 34

which library is used for regular expressions

Answer 34

re library used in Python for regular expression

Question 35

how to search first instance only

Answer 35

string = ‘his name is hemant, it section hemant’

re.search(r’hemant’,string)

Question 36

how to search all occurrences in a string

Answer 36

we have to use findall method

text = “my phone is a new phone”

matches = re.findall(“phone”,text)

matches

Question 37

how to use for loop with re

Answer 37

we have to use finditer method

text = “my phone is a new phone”
for match in re.finditer(“phone”,text):
print(match.span()) military parade