Text Strings

• Strings in python

message = "Hello"
language = 'python'
more_info = '''Python is used in building
command line applications
desktop application
web application
machinelearning models
'''
more_info = """Python is used in building
command line applications
desktop application
web application
machinelearning models
"""

• f-Strings: They can be used for string interpolations

name = "Ram"
course = 'Python'
message = f"Hello {name}, Im glad you started learning {course}"

• Useful methods of string
  • endswith
  • find
  • lower
  • replace
  • split
  • startswith
  • upper
  • capitalize

Lists

• Lists are ordered collection of arbitrary objects. We can create the list by enclosing the values in square brackets as follows

job_roles = ['Developer', 'Tester', 'Administrator']
my_values = [1, 2.0, 'fun']

• To access the values of the list we can use index. The index of list starts from zero

job_roles[0]
job_roles[2]

• To append elements at the end of list we use append

job_roles.append('Manager')

• To insert an element at certain position we use insert

job_roles.insert(2, 'Team Lead')

• To get the count of elements in the list we can use len

len(job_roles)

• Now lets use a while to print all the elements of the list

index = 0
while index < len(job_roles):
    print(job_roles[index])
    index += 1

• To iterate the elements in a list we can also use a for loop

for job_role in job_roles:
    print(job_role)

• List slicing
  • Slicing is possible in lists by using the slicing operator “`start:end:step“
  • default value of start is 0 and default value step 1
  • In python lists also have negative indexes
• lists are mutable they allow us to change the values

colors[0] = 'Violet'

• empty [] indicates empty list

Tuples

• Tuple is also a collection values and it is immutable
• Tuple is enclosed by a group of values in paranthesis

rainbow = ('Violet', 'Indigo', 'Blue', 'Green', 'Yellow', 'Orange', 'Red')

• We can use the while or for loop like what we have done for lists to iterate the tuple