Strings

Strings can be created by enclosing characters inside a single quote or double-quotes and the output will be the same. They are immutable, you can’t modify the content.

Example:

'Hello' is the same that "Hello" 

This is not correct:

"Hello Everyone'

You can’t mix both quotes as start to write with single quote and close with double.

To assign string to a variable

Assigning a string to a variable is done with the variable name followed by an equal sign and the string.

Example:

name = "Ellie"
print(name)
Ellie

Check string

To check if a phrase or character is present in a string, we can use the keyword in.

Example:

phrase= "To have a good life you only need to be happy"
print("good life" in phrase)
True
print("bad life" in phrase)
False

Check if NOT

To check if a phrase or character is NOT present in a string, we can use the keyword not in.

Example:

a = "Your are learning python"
print("python" not in a)
False

The check function it’s very useful when you need to check long text:

definition = ("Python is an interpreted, high-level and general-purpose programming language. Python's design philosophy emphasizes code readability with its notable use of significant whitespace. Its language constructs and object-oriented approach aim to help programmers write clear, logical code for small and large-scale projects.")

print("logical code" in definition)
True
print("to help" not in definition)
False

Delete string

To be able to remove the string entirely you new to use the del keyword.

Example:

name = "Ellie"
del name
print(name)

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'name' is not defined

Change string

Strings are immutable. This means that elements of a string cannot be changed once they have been assigned. We can simply reassign different strings to the same name.

Example:

name = "Louis"
name = "Ellie"
print(name)
Ellie

String Length

To get the length of a string, use the len() function.

Example:

names = "Louis and Peter"
print(len(names))
15

b = "You are learning programming"
print(len(b))
28

Multiline Strings

Are delimited by 3 quotes characters and the new lines are represented by the \n. You can use single o double quotes.

Example:

"""This is
a multiline
string"""
'This is\na multiline\nstring'