![Python- Strings
• Example:
var1 = 'Hello World!'
var2 = "Python Programming"
print ("var1[0]: ", var1[0])
print ("var2[1:5]: ", var2[1:5])
• Updating Strings
You can "update" an existing string by (re)assigning a variable to another string.
The new value can be related to its previous value or to a completely different string
altogether.
For example-
#!/usr/bin/python3
var1 = 'Hello World!'
print ("Updated String :- ", var1[:6] + 'Python')
Output:
var1[0]: H
var2[1:5]: ytho
Output:
Updated String :- Hello Python
2](https://image.slidesharecdn.com/unit1-part-3-stringmanipulation-250616033013-d2890a5d/85/Unit-1-Part-3-String-Manipulation-pdf-2-320.jpg)
![Python- Strings
Output:
str.capitalize() : This is string example
str.center(40, 'a') : aaaathis is string
exampleaaaa
String center() Method
The method center() returns centered in a string of length width. Padding is done using
the specified fillchar. Default filler is a space.
Syntax
str.center(width[, fillchar])
Parameters
• width - This is the total width of the string.
• fillchar - This is the filler character.
Return Value
This method returns a string that is at least width characters wide, created by padding the
string with the character fillchar (default is a space).
Example
The following example shows the usage of the center() method.
#!/usr/bin/python3
str = "this is string example.
print ("str.center(40, 'a') : ", str.center(40, 'a'))
18](https://image.slidesharecdn.com/unit1-part-3-stringmanipulation-250616033013-d2890a5d/85/Unit-1-Part-3-String-Manipulation-pdf-18-320.jpg)
Unit 1-Part-3 - String Manipulation.pdf
- 1. Python- Strings • Strings are amongst the most popular types in Python. • We can create them simply by enclosing characters in quotes. • Python treats single quotes the same as double quotes. • Creating strings is as simple as assigning a value to a variable. For example var1 = 'Hello World!' var2 = "Python Programming" Accessing Values in Strings • Python does not support a character type; these are treated as strings of length one, thus also considered a substring. • To access substrings, use the square brackets for slicing along with the index or indices to obtain your substring. 1
- 2. Python- Strings • Example: var1 = 'Hello World!' var2 = "Python Programming" print ("var1[0]: ", var1[0]) print ("var2[1:5]: ", var2[1:5]) • Updating Strings You can "update" an existing string by (re)assigning a variable to another string. The new value can be related to its previous value or to a completely different string altogether. For example- #!/usr/bin/python3 var1 = 'Hello World!' print ("Updated String :- ", var1[:6] + 'Python') Output: var1[0]: H var2[1:5]: ytho Output: Updated String :- Hello Python 2
- 3. Python- Strings • Escape Characters • Following table is a list of escape or non-printable characters that can be represented with backslash notation. • An escape character gets interpreted; in a single quoted as well as double quoted strings. 3
- 4. Python- Strings • String Special Operators • Assume string variable a holds 'Hello' and variable b holds 'Python', then- 4
- 5. Python- Strings • String Special Operators 5
- 6. Python- Strings • String Formatting Operators 6
- 7. Python- Strings • String Formatting Operators 7
- 8. Python- Strings • Other supported symbols and functionality 8
- 9. Python- Strings • Unicode String • In Python 3, all strings are represented in Unicode. In Python 2 are stored internally as 8- bit ASCII, hence it is required to attach 'u' to make it Unicode. It is no longer necessary now. • Built-in String Methods • Python includes the following built-in methods to manipulate strings- 9
- 10. Python- Strings • Unicode String 10
- 11. Python- Strings • Unicode String 11
- 12. Python- Strings • Unicode String 12
- 13. Python- Strings • Unicode String 13
- 14. Python- Strings • Unicode String 14
- 15. Python- Strings • Unicode String 15
- 16. Python- Strings • Unicode String 16
- 17. Python- Strings • Unicode String String capitalize() Method It returns a copy of the string with only its first character capitalized. Syntax str.capitalize() Example: str = "this is string example” print ("str.capitalize() : ", str.capitalize()) Output: str.capitalize() : This is string example 17
- 18. Python- Strings Output: str.capitalize() : This is string example str.center(40, 'a') : aaaathis is string exampleaaaa String center() Method The method center() returns centered in a string of length width. Padding is done using the specified fillchar. Default filler is a space. Syntax str.center(width[, fillchar]) Parameters • width - This is the total width of the string. • fillchar - This is the filler character. Return Value This method returns a string that is at least width characters wide, created by padding the string with the character fillchar (default is a space). Example The following example shows the usage of the center() method. #!/usr/bin/python3 str = "this is string example. print ("str.center(40, 'a') : ", str.center(40, 'a')) 18