Let’s create a new list that includes some great bands, but this time let’s do things differently. join() ‘the quick brown fox jumps over the lazy dog’ The join method in Python is used to concatenate a list of strings.įor example > ‘ ‘.
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When you print the “z” string object – after executing the code above – it will return the following: In the basket are apples and lemons String Formatting with the years old.” format( fname, lname, age) Using the Join Method In Python What this example code will do is replace the “%s” operator values with the corresponding string, in the order we have set. x = ‘apple s ’ y = ‘lemon s ’ z = “ In the basket are %s and %s” % ( x,y )
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The best way to understand how to work with operators is to look at active code. However, it’s still a good idea – and common practice – to become familiar with the method. Eventually, it will be removed altogether from future versions of the language.
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String Formatting with the % Operatorīefore we take a closer look, it’s important to understand that the % string operator will be deprecated – no longer used – in Python 3.1 and up. Hopefully, you are more familiar with the term yourself because it’s a crucial element of any programming language, especially Python. To put it simply, it helps developers with string formatting and concatenation. String interpolation is a term used to describe the process of evaluating a string value that is contained as one or more placeholders. In Python, we can take advantage of two separate methods of string interpolation. Notice how the interpreter simply combined the two objects and spit them out when it was asked to print the data? String Formatting in Python The method we used to do this is the str ( ) function. The code for that would look like this: > print ‘red’ + str ( 3) red3 > To make this possible, we can convert the number into a string using the appropriate function. It makes sense why the error happens when you look at it this way. Python cannot add a word and number together. An integer on the other hand is a recorded number value that doesn’t have a decimal point. In layman’s terms, a string can be any recorded characters but it’s most commonly used to store words and information. This is where we are trying to concatenate a string and integer object, and it failed. In addition, we can see when trying to combine ‘red’ and 3 the interpreter spits out an error. This is important, so be sure to record it to memory. Notice how multiplying the string “red” three times returns the value “redredred”. > print ‘red’ + ‘yellow’ Redyellow > print ‘red’ * 3 Redredred > print ‘red’ + 3 Traceback (most recent call last): File “”, line 1, in TypeError : cannot concatenate ‘ str ’ and ‘ int ’ objects >įor reference, the “>” characters indicate where the interpreter is requesting a command. It was copied from David Bau’s personal website.
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The following example shows what happens when you try to merge a string and integer object. So, if you want to merge the two, you will need to convert the integer to a string.
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These are considered two separate types of objects. One thing to note is that Python cannot concatenate a string and integer. The final line in this code is the concatenation, and when the interpreter executes it a new string will be created. When writing code, that would look like this: str1 = “Hello” str2 = “World” str1 + str2 In order to merge two strings into a single object, you may use the “+” operator. Obviously, this is because everything in Python is an object – which is why Python is an objected-oriented language. The new string that is created is referred to as a string object. In Python, there are a few ways to concatenate – or combine – strings. After, we will explore formatting, and how it works. There are different ways to do that, and we will discuss the most common methods. This post will describe how to concatenate strings in Python.