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Title: Learn More Using String Methods (Video) – Real Python

Open Graph Title: Learn More Using String Methods – Real Python

Description: In this part of the course, you’ll learn more about a couple of Python string methods that you can use to learn more about the substring. I’ll start off by showing you a little table that gives you an overview about what’s the name of the string…

Open Graph Description: In this part of the course, you’ll learn more about a couple of Python string methods that you can use to learn more about the substring. I’ll start off by showing you a little table that gives you an overview about what’s the name of the string…

Opengraph URL: https://realpython.com/lessons/string-methods-python-substring/

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00:00https://realpython.com/lessons/string-methods-python-substring/#t=0.56
In this part of the course,https://realpython.com/lessons/string-methods-python-substring/#t=0.56
you’ll learn more about a couple of Python string methods that you can use tohttps://realpython.com/lessons/string-methods-python-substring/#t=1.75
learn more about the substring.https://realpython.com/lessons/string-methods-python-substring/#t=6.15
I’ll start off by showing you a little table that gives you an overview abouthttps://realpython.com/lessons/string-methods-python-substring/#t=8.1
what’s the name of the string method, what happens if it does find a substring,https://realpython.com/lessons/string-methods-python-substring/#t=11.83
and what happens if it doesn’t find the substring. One that you’re going to look athttps://realpython.com/lessons/string-methods-python-substring/#t=15.99
is str.count(),https://realpython.com/lessons/string-methods-python-substring/#t=20.56
and this is a way to get a count of how often does a substring appear in ahttps://realpython.com/lessons/string-methods-python-substring/#t=22.33
string. So if it finds the substring,https://realpython.com/lessons/string-methods-python-substring/#t=26.79
it gives you back an integer that tells you how often it is found inside of thehttps://realpython.com/lessons/string-methods-python-substring/#t=29.55
string. And if it’s never found, then it returns the integer 0.https://realpython.com/lessons/string-methods-python-substring/#t=33.35
00:39https://realpython.com/lessons/string-methods-python-substring/#t=39.12
Then there’s str.index().https://realpython.com/lessons/string-methods-python-substring/#t=39.12
That’s a way for you to locate the substring in the string. And what it does,https://realpython.com/lessons/string-methods-python-substring/#t=40.73
it gives you back the start index of where the first occurrence of the substringhttps://realpython.com/lessons/string-methods-python-substring/#t=45.49
is found inside of the string that you’re searching in.https://realpython.com/lessons/string-methods-python-substring/#t=50.18
00:53https://realpython.com/lessons/string-methods-python-substring/#t=53.4
What it does when there is no substring in the string is to raise a ValueError.https://realpython.com/lessons/string-methods-python-substring/#t=53.4
00:59https://realpython.com/lessons/string-methods-python-substring/#t=59.52
And then there’s also str.find() that does the same thing as str.index()https://realpython.com/lessons/string-methods-python-substring/#t=59.52
in the success condition. So if it finds the substring,https://realpython.com/lessons/string-methods-python-substring/#t=63.99
then it gives you back the starting index position.https://realpython.com/lessons/string-methods-python-substring/#t=66.73
01:10https://realpython.com/lessons/string-methods-python-substring/#t=70.0
But if the substring isn’t found, then instead of raising a ValueError,https://realpython.com/lessons/string-methods-python-substring/#t=70.0
it returns -1.https://realpython.com/lessons/string-methods-python-substring/#t=73.79
I’ll tell you more about str.index() and str.find() throughout this course.https://realpython.com/lessons/string-methods-python-substring/#t=76.17
01:20https://realpython.com/lessons/string-methods-python-substring/#t=80.28
You may have seen str.find() used to check whether a substring is in thehttps://realpython.com/lessons/string-methods-python-substring/#t=80.28
string. I don’t consider this a good way to do it,https://realpython.com/lessons/string-methods-python-substring/#t=84.78
but I’ll show you how to do it later on in the course so that you also can maybehttps://realpython.com/lessons/string-methods-python-substring/#t=87.74
see for yourself how it works and why using the in operator is a better choice.https://realpython.com/lessons/string-methods-python-substring/#t=92.22
01:37https://realpython.com/lessons/string-methods-python-substring/#t=97.52
But all of these string methods have their use cases.https://realpython.com/lessons/string-methods-python-substring/#t=97.52
They are useful for learning more about the substring.https://realpython.com/lessons/string-methods-python-substring/#t=100.61
And now let’s head back over to the REPL to try them out and learn a little morehttps://realpython.com/lessons/string-methods-python-substring/#t=103.44
about your substring.https://realpython.com/lessons/string-methods-python-substring/#t=107.18
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Overviewhttps://realpython.com/courses/python-string-contains-substring/
https://realpython.com/lessons/count-substring-python/
Check if a Python String Contains a Substring (Overview) 02:00 https://realpython.com/videos/python-string-contains-substring-overview/
Confirm the Presence of a Substring 04:31 https://realpython.com/videos/confirm-substring-python/
Generalize Your Substring Check 04:10 https://realpython.com/videos/generalize-substring-check/
Learn More Using String Methods 01:49 https://realpython.com/lessons/string-methods-python-substring/
Use .count() to Get the Number of Occurrences 02:30 https://realpython.com/lessons/count-substring-python/
Use .index() to Get the Location of the Substring 02:35 https://realpython.com/lessons/index-python-substring/
Avoid Using .find() to Check for Substrings 05:20 https://realpython.com/lessons/avoid-find-python-substring/
Get to Know Regex for Finding Substrings 01:32 https://realpython.com/lessons/substrings-regex-python-intro/
Match a Substring Using re.search() 03:51 https://realpython.com/lessons/substring-re-search-python/
Explore a Match Object 03:25 https://realpython.com/lessons/match-object-substring/
Find All Pattern Matches 03:28 https://realpython.com/lessons/find-pattern-matches-python/
Get All Matches as Match Objects 03:26 https://realpython.com/lessons/get-match-objects-python/
Wrap Up Finding Substrings With Regex 01:51 https://realpython.com/lessons/substrings-regex-python-summary/
Set Up and Inspect the Data 02:10 https://realpython.com/lessons/inspect-pandas-data/
Filter DataFrame Rows With .str.contains() 02:03 https://realpython.com/lessons/filter-dataframe-str-contains/
Use Regular Expressions With pandas 02:23 https://realpython.com/lessons/regular-expressions-pandas/
Check if a Python String Contains a Substring (Quiz) 11:00 https://realpython.com/lessons/python-string-contains-substring-quiz/
Check if a Python String Contains a Substring (Summary) 02:22 https://realpython.com/lessons/python-string-contains-substring-summary/
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