How to change variable datatype in Python?

There are lots of datatype conversion which are possible in python. I am listing some of the commonly used conversions which are important.

string to integer
integer to string
integer to float
float to integer
string to date

string to integer

This type of conversion is used when need to perform mathematical operations on a part of string which is number.

'''string to integer datatype conversion'''

# defining int as an string
intVar='10'

# Print datatype before conversion
print('Datatype Before conversion',type(intVar))

# Converting the datatype to integer
intVar=int(intVar)

# Print datatype after conversion
print('Datatype after conversion',type(intVar))

# common use in performing mathematical opeations
# which is not possible on strings
print('The percentage of products sold were',100*(intVar/100),'%')

'''string to integer datatype conversion'''

# defining int as an string

intVar='10'

# Print datatype before conversion

print('Datatype Before conversion',type(intVar))

# Converting the datatype to integer

intVar=int(intVar)

# Print datatype after conversion

print('Datatype after conversion',type(intVar))

# common use in performing mathematical opeations

# which is not possible on strings

print('The percentage of products sold were',100*(intVar/100),'%')

Sample Output

String to Integer datatype conversion in Python

integer to string

This type of conversion is commonly used when we need to combine a string and number together into a single string message.

'''integer to string datatype conversion'''

# defining an integer variable
intVar=10

# Print datatype before conversion
print('Datatype Before converion',type(intVar))

# Converting the datatype to integer
intVar=str(intVar)

# Print datatype after conversion
print('Datatype after conversion',type(intVar))

# common use in creating custom messages
strMessage='The number of products sold are ' + str(200) + ' units'
print(strMessage)

'''integer to string datatype conversion'''

# defining an integer variable

intVar=10

# Print datatype before conversion

print('Datatype Before converion',type(intVar))

# Converting the datatype to integer

intVar=str(intVar)

# Print datatype after conversion

print('Datatype after conversion',type(intVar))

# common use in creating custom messages

strMessage='The number of products sold are ' + str(200) + ' units'

print(strMessage)

Sample Output

Integer to String datatype conversion in Python

integer to float

This type of datatype conversion is used when we need decimal point precision in the numbers.

# integer to float datatype conversion

# defining an integer variable
intVar=10

# Print datatype before conversion
print('Datatype Before conversion',type(intVar))

# Converting the datatype to integer
intVar=float(intVar)

# Print datatype after conversion
print('Datatype after conversion',type(intVar))


# common use in getting decimal precision
strMessage='The percentage of products sold are ' + str(float(10)) + ' units'
print(strMessage)

# integer to float datatype conversion

# defining an integer variable

intVar=10

# Print datatype before conversion

print('Datatype Before conversion',type(intVar))

# Converting the datatype to integer

intVar=float(intVar)

# Print datatype after conversion

print('Datatype after conversion',type(intVar))

# common use in getting decimal precision

strMessage='The percentage of products sold are ' + str(float(10)) + ' units'

print(strMessage)

Sample Output

Integer to Float datatype conversion in Python

float to integer

This type of conversion is commonly used when we are representing values which are quantities and generated as a result of some division operation.

# float to integer datatype conversion

# defining an integer variable
floatVar=10.22

# Print datatype before conversion
print('Datatype Before conversion',type(floatVar))

# Converting the datatype to integer
# and assigning to new variable
intVar=int(floatVar)

# Print datatype after conversion
print('Datatype after conversion',type(intVar))


# common use in representing quantities
strMessage='The product per person are ' + str(int(200/22)) + ' units'
print(strMessage)

# float to integer datatype conversion

# defining an integer variable

floatVar=10.22

# Print datatype before conversion

print('Datatype Before conversion',type(floatVar))

# Converting the datatype to integer

# and assigning to new variable

intVar=int(floatVar)

# Print datatype after conversion

print('Datatype after conversion',type(intVar))

# common use in representing quantities

strMessage='The product per person are ' + str(int(200/22)) + ' units'

print(strMessage)

Sample Output

Float to Integer datatype conversion in Python

String to Date

Date is a special datatype, although date values look like strings but, there are many operations we can perform using a date like comparison, difference in date etc. Most of time you get a date string as an input to your applications/programs. Hence, we must convert that string type to date type using library “datetime” in order to perform the date operations.

# String to Date datatype conversion

# defining an string variable
stringDate='21-10-2020'

# Print datatype before conversion
print('Datatype Before conversion',type(stringDate))

# Converting the datatype to Date
# and assigning to new variable
import datetime
StartDate=datetime.datetime.strptime(stringDate, '%d-%m-%Y')

# Print datatype after conversion
print('Datatype after conversion',type(StartDate))
print(StartDate)

# common use in finding difference in days from other date
Deadline=datetime.datetime(2021,12,24)
DateDifference=Deadline-StartDate

print('Difference in the deadline and start date is:',DateDifference.days, 'days')

# String to Date datatype conversion

# defining an string variable

stringDate='21-10-2020'

# Print datatype before conversion

print('Datatype Before conversion',type(stringDate))

# Converting the datatype to Date

# and assigning to new variable

import datetime

StartDate=datetime.datetime.strptime(stringDate, '%d-%m-%Y')

# Print datatype after conversion

print('Datatype after conversion',type(StartDate))

print(StartDate)

# common use in finding difference in days from other date

Deadline=datetime.datetime(2021,12,24)

DateDifference=Deadline-StartDate

print('Difference in the deadline and start date is:',DateDifference.days, 'days')

Sample Output

String to Date datatype conversion in python

Popular String to date formats

# importing the library
import datetime

# Generating dates using various string input formats
print(datetime.datetime.strptime('22-April-2020', '%d-%B-%Y'))
print(datetime.datetime.strptime('22-04-2020', '%d-%m-%Y'))
print(datetime.datetime.strptime('04/22/2020', '%m/%d/%Y'))
print(datetime.datetime.strptime('Mar/22/2020', '%b/%d/%Y'))

# importing the library

import datetime

# Generating dates using various string input formats

print(datetime.datetime.strptime('22-April-2020', '%d-%B-%Y'))

print(datetime.datetime.strptime('22-04-2020', '%d-%m-%Y'))

print(datetime.datetime.strptime('04/22/2020', '%m/%d/%Y'))

print(datetime.datetime.strptime('Mar/22/2020', '%b/%d/%Y'))

Sample Output

Author Details

Farukh Hashmi

Lead Data Scientist

Farukh is an innovator in solving industry problems using Artificial intelligence. His expertise is backed with 10 years of industry experience. Being a senior data scientist he is responsible for designing the AI/ML solution to provide maximum gains for the clients. As a thought leader, his focus is on solving the key business problems of the CPG Industry. He has worked across different domains like Telecom, Insurance, and Logistics. He has worked with global tech leaders including Infosys, IBM, and Persistent systems. His passion to teach inspired him to create this website!

https://thinkingneuron.com/

thinkingneuron@gmail.com

string to integer

integer to string

integer to float

float to integer

String to Date

Leave a Reply! Cancel Reply