Strings

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Prerequisite Terminologies

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Transcription

By:

Hamsa Ehsan

Introduction:

In Python, Strings are the consecutive collection of characters. A character is plainly a symbol. Strings are enclosed by either single quotation or double quotations. For Example, in Bioinformatics, DNA, RNA or protein are taken in as strings which are the sequences of nucleotides.


Steps:

Assigning to a Variable

  • Open the visual studio code.

  • Declare a variable and assign a string to it enclosed in single or double quotes.

  • Print that variable.

  • Go to ‘Debug’ and select ‘Run without debugging’.

  • It displays the string you assigned to that variable.


Without Assigning to a Variable

  • You can directly write the string in the print(“ ”) function without assigning it to a variable first.

  • Go to ‘Debug’ and select ‘Run without debugging’.

  • It displays the string you wrote in the parameter of Print function.


Built-in Functions With Strings

  • Just like print(“ ”) function, Strings can be used with any of Python’s built-in functions which can be accessed from Python Prompt.

  • For that, assign a string to a variable.

  • Call this variable with a dot ‘.’ operator proceeding with any built-in function from the Prompt.

  • You can assign this statement to a variable and print it or you can call it in print(“ ”) function directly.

  • Go to ‘Debug’ and select ‘Run without debugging’.

  • It displays the returned string from that function.


Syntax:

variableName = ‘string’

variable.function()


Summary:

In this video, we discussed strings in Python and how we can use them with different Python’s built-in functions such as .upper(), .lower(), .capitalize(), .replace(old, new) and those which can be helpful in Bioinformatics are .startswith(“ ”) and .endswith(“ ”).

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