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Basic Knowledge of Python part 2

Strings using python -

Other than numbers python can also handle strings which can be expressed by several ways. In programming a string is a contiguous sequence of symbols or values such as a character string or digit string. Strings is declared in a '....' (single quotes) or "...." (double quotes). 

  

By using '\n' you can insert the string to the new line by using print() command. For example:


 We can concatenate string by using + operator. Concatenate means we can merge two or more separate strings by using + operator. For example:


We see another example of multiple concatenate.


Here 3*'py' means the string 'py' repeats 3 times and same for the 'thon' string.

Now we another method to concatenate two or more strings. In this method you have write strings next to each other without any operator. For example:


In the python string is stored in indexes. The index is start from 0 (zero). In python indexes also be calculated from reverse side and this index is start from -1. Lets see example

str = 'Python'

Indexes
 01 2 3 4 5 
 Py t h o n 
 -6 -5 -4-3  -2-1 
Indexes

With the help of indexing you can separate out the string means that you can get some part of main string using indexes. For example:


Related to the indexing now we see the slicing. In slicing you get a substring of the main string instead of getting single character. If we want 'tho' substring from 'Python' main string we use slicing. For these please refer above indexing table. 

 

Here value before colon is the starting index and value after colon is ending index so that you can get the values between these two indexes. 

We see some more examples on slicing.

If you want first two and last two characters from main string you should write this code:



We will learn more about strings in the different section.

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