Python Learning Session –06 - Sting Data Type

string data type in Python:

  introduction about the string data type in python 

String is nothing but is only set of character i.e “Techshoot03” it set of alphabet characters “ T,e,c,h,s,h,o,o,0,3 ” . All the set of character are get to gather and make one word and set of words are call String.

 There are so many Data type are available in the programing all languages are same data type are used

 Lest we seen how many data type are available in programing.

·         Intrigue

·         Boolean

·         String

·         Double

·         Float

·         Complex

·         List

·         Tuple

·         Dict

·         Set

“Mastering Python Strings: A Comprehensive Guide”

Dive deep into string manipulation, slicing, and formatting techniques.

Cover common use cases and best practices for handling strings.

 

“Python String Methods Every Developer Should Know”

Explore essential string methods like split(), join(), replace(), and more.

Provide practical examples and tips for efficient string processing.

 

“Formatting Strings in Python: A Detailed Overview”

Discuss f-strings, .format(), and % formatting.

Explain when to use each method and their pros/cons.

 

“Exploring Python’s Built-in String Functions”

Highlight lesser-known string functions like isalpha(), startswith(), and count().

Showcase their applications and performance considerations.

 

“String Manipulation in Python: Tips and Tricks for Efficiency”

Share tricks for optimizing string concatenation, searching, and case conversion.

Address memory usage and performance bottlenecks.

 

Example : -

Code : - a = “hello techshoot03”

Print (a)                   --  then press the enter and check the result as we seen in the snap

 Looking Inside Strings :

We can get at any single character in a string using an index specified in square brackets

The index value must be an integer and starts at zero

The index value can be an expression that is computed

Lest we more undartanding we go throw the code :

Code : -

>>> a = "hello Techshoot03"

>>> print ( a )

hello Techshoot03

>>> 

>>> a = 3

>>> b = a [a-1]

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

TypeError: 'int' object is not subscriptable

>>> demo = "hello techshoot03"

>>> test = demo[1]

>>> print (test)

e

>>> a = 3

>>> b = demo[a-1]

>>> print(b)

l

>>> 

The built-in function len gives us the length of a string

Code : -

 >>> demo = "hello techshoot03"

>>> print(len(demo))

17

>>> 

LEN A function is some stored code that we use. A function takes some input and produces an output.

Looping and Counting of Strings : -

This is a simple loop that loops through each letter in a string and counts the number of times the loop encounters the 'a' character

Slicing Strings: -

We can also look at any continuous section of a string using a colon operator

The second number is one beyond the end of the slice – “up to but not including”

If the second number is beyond the end of the string, it stops at the end

If we leave off the first number or the last number of the slice, it is assumed to be the beginning or end of the string respectively

 When the  +  operator is applied to strings, it means “concatenation”

The in keyword can also be used to check to see if one string is “in” another string

The in expression is a logical expression that returns True or False and can be used in an if statement

String Comparison :

String Library: -

·         str.capitalize()

·         str.center(width[, fillchar])

·         str.endswith(suffix[, start[, end]])

·         str.find(sub[, start[, end]])

·         str.lstrip([chars])

·         str.replace(old, new[, count])

·         str.lower()

·         str.rstrip([chars])

·         str.strip([chars])

·         str.upper()

Searching a String : -

We use the find() function to search for a substring within another string

find() finds the first occurrence of the substring

If the substring is not found, find() returns -1

Remember that string position starts at zero

 

Code : -

>>>demo = 'Techshoot03'

>>> test = demo.find('Te')

>>> print(test)

1 - --  Result

 

You can make a copy of a string in lower case or upper case

Often when we are searching for a string using find() we first convert the string to lower case so we can search a string regardless of case

The replace() function is like a “search and replace” operation in a word processor

It replaces all occurrences of the search string with the replacement string

Sometimes we want to take a string and remove whitespace at the beginning and/or end

lstrip() and rstrip() remove whitespace at the left or right

strip() removes both beginning and ending whitespace