Basic String Operations

Strings are bits of text. They can be defined as anything between quotes:

string = "Hello world!"
string2 = 'Hello world!'

As you can see, the first thing you learned was printing a simple sentence. This sentence was stored by Python as a string. However, instead of immediately printing strings out, we will explore the various things you can do to them. You can also use single quotes to assing a string. However, you will face problems if the value to be assigned itself contains single quotes.For example to assign the string in these bracket(single quotes are ' ') you need to use double quotes only like this

print "single quotes are ' '"

string = "Hello world!"
print len(string)

That prints out 12, because "Hello world!" is 12 characters long, including punctuation and spaces.

string = "Hello world!"
print string.index("l")

That prints out 2, because the location of the first occurrence of the letter "l" is 2 characters away from the first character.  Python (and most other programming languages) start counting things at 0 instead of 1. So the index of "l" is 1.

print string[3:7]

This prints a slice of the string, starting at index 3, and ending at index 6. But why 6 and not 7 ?  it makes doing math inside those brackets easier.

Reverse String

print string[::-1]

Uppercase String

print string.upper()

Lowercase String

print string.lower()

Check Occurence of String

Checks if string starts with "Hello"

print string.startswith("Hello")

Checks if string ends with "asdfasdfasdf"

print string.endswith("asdfasdfasdf")

Explode or Split the string

splitWords = string.split(" ")

This splits the string into a bunch of strings grouped together in a list. Since this example splits at a space, the first item in the list will be "Hello", and the second will be "world!".

There are more in python. We will soon launch course only for strings soon.


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