Strings

How To Get First And Last N Characters From A String In Python

It can be quite easy to get the first character in a string, but how can you get the first n characters from a string? Or what about the last n characters? To get more than one character from a string you can use the slice operator which has the syntax [start:stop:step]. For example, to get the first 5 characters from a string variable my_string use the slice operator as follows my_string[:5] or to get the last 5 characters from a string use my_string[-5:]. ...

Convert Percentage String To Decimal Like 30% To 0.3 In Python

How do you convert a string representing a percentage number into an actual number that can be used to perform calculations? To convert a string represented as a percentage number into an actual decimal number in Python use the built-in float() function after removing the percent symbol from the string and any other characters that prevent numeric conversion. Without purging from the original string the percent symbol you will get a ValueError as demonstrated below in the Python REPL: ...

3 Ways To Check If String Can Convert To Integer In Python

How do you know if a string will convert to an integer in Python? There are 3 ways to check if a string will convert to an integer in Python and these methods are: use a try-catch on the int(string) operation or perform an operation on the string to remove all integers and see if anything is left – use either the regex library or the string.replace() method. Let’s look at each approach in a little more detail and use an example or two. ...

Python Lower: Examples

How do you get a string to be all lowercase in Python? Thankfully there’s a built-in method that doesn’t require importing any external libraries to get a string to lower case, here’s how you do it. To get a string to all lowercase, use the built-in string method .lower(), which turns all characters in the string variable to lower case. Here is an example demonstrating the transformation of a string containing upper cases and converting them all to lower cases: ...

How To Get First Character From String (Shortest Code And Examples)

Is there a quick and easy way to get the first character from a string in Python? Yes, there is using the slice operator. To get the first character in a string simply use the code my_string[0] where my_string is a variable containing the string and the slice operator [0] captures the first index of that string, being the first character. ...

How To Get Last Character From A String (Shortest Code Examples)

How do you get the last character from a string using Python? Thankfully Python has an easy way to fetch the last character from a string using the slice operator. To get the last character of the string in Python use the syntax my_string[-1]. The square brackets are used to indicate a specific character by index number, and as string data types can be iterated, you can use the slice operator [:], specifically -1 inside to capture the last character. ...

How To Remove First & Last Characters From String In Python (Code Examples)

How can you remove the first and last characters from a string easily in Python? Can it be done using just one line of code? To remove the first and last characters from a string in Python use the slice operator on the string to return the needed characters, for example, my_string[1:-1]. Here is an example demonstrating the technique: 1 2 3 >>> my_string = "<html>" >>> my_string[1:-1] 'html' Slice Notation: How Does It Work? The powerful slice operator in Python allows you to capture a range according to the following pattern: ...

Check Empty String Python - 3 Unique Approaches

How can you check if a string is empty in Python? To determine if a string is empty in Python use of the following three means available: see if the string has any length by using the built-in len() function, do a direct comparison using the expression == "" or convert the string to a boolean data type and if the result is false it is an empty string. Let’s look at each approach and see how they perform. ...

Check For Word In String: Python 1 Liner

How can you check if a word is found in a string using Python? Recently, I had an issue where I wanted to exclude strings from a list if they contained a certain word. I thought I could use the following common code familiar to most using Python: i f # ' w d o o r d s ' o m i e n t h ' i h n o g w t o f i n d w o r d i n s t r i n g ' : But the problem ended up being a little more difficult than that. For example, what if you want to exclude the term word but not if that word is found inside other words, like sword? ...