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findall, search, split, sub Function in Python 3.7

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  The findall() Function The  findall()  function returns a list containing all matches. Example Print a list of all matches: import  re txt =  "The rain in Spain" x = re.findall( "ai" ,  txt) print (x) The list contains the matches in the order they are found. If no matches are found, an empty list is returned: Example Return an empty list if no match was found: import  re txt =  "The rain in Spain" x = re.findall( "Portugal" ,  txt) print (x) The search() Function The  search()  function searches the string for a match, and returns a  Match object  if there is a match. If there is more than one match, only the first occurrence of the match will be returned: Example Search for the first white-space character in the string: import  re txt =  "The rain in Spain" x = re.search( "\s" ,  txt) print ( "The first white-space character is located in position:" , x.start()) If no matches are found, the value  N...
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Try Except, Raise an exception, String Formatting in Python 3.7

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  Python  Try Except:- The  try  block lets you test a block of code for errors. The  except  block lets you handle the error. The  finally  block lets you execute code, regardless of the result of the try- and except blocks. Exception Handling When an error occurs, or exception as we call it, Python will normally stop and generate an error message. These exceptions can be handled using the  try  statement: Example The  try  block will generate an exception, because  x  is not defined: try :    print (x) except :    print ( "An exception occurred" ) Since the try block raises an error, the except block will be executed. Without the try block, the program will crash and raise an error: Example This statement will raise an error, because  x  is not defined: print (x) Many Exceptions You can define as many exception blocks as you want, e.g. if you want to execute a special block of code for ...
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Python Arrays and Array Methods...

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  Python Arrays:- Note:  This page shows you how to use LISTS as ARRAYS, however, to work with arrays in Python you will have to import a library, like the   NumPy library . Arrays are used to store multiple values in one single variable: Example Create an array containing car names: cars = [ "Ford" ,  "Volvo" ,  "BMW"  ,  " lamborghini " ] What is an Array? An array is a special variable, which can hold more than one value at a time. If you have a list of items (a list of car names, for example), storing the cars in single variables could look like this: car1 =  "Ford" car2 =  "Volvo" car3 =  "BMW" car4 =  " lamborghini" However, what if you want to loop through the cars and find a specific one? And what if you had not 3 cars, but 300? The solution is an array! An array can hold many values under a single name, and you can access the values by referring to an index number. Adding Array Elements:- You can u...
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