Zero basic science Python_ 02_ String (case conversion)

open_51airx3z 2020-11-11 09:24:02
zero basic science python_ python

​ The first data type we'll introduce is string .
Although the string seems simple , But they can be used in many different ways .
A string is a series of characters , stay Python in , It's all strings in quotation marks , The quotation marks can be single quotation marks , Or double quotes , As shown below :
"This is bcbx."
'This is bcbx_home.'
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This flexibility allows you to include quotation marks and apostrophes in strings :
'I told my friend, "I love bcbx!"'
"The language 'Python' is named after Monty Python, not the snake."
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Here are some ways to use strings
Use the method to modify the size of the string

For strings , One of the simplest things you can do is change the case of the words in it . Look at the code below , And try to judge its function :
name = "come on bcbx"
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Execution results :
In this example , A lowercase string "come on bcbx" Stored in variable name in . stay print() In the sentence , Method title() It appears after this variable .
The method is Python Operations that can be performed on data .

stay name.title() in ,name Period after (. ) Give Way Python The variable name Execution method title() Specified operation . Each method is followed by a pair of parentheses , This is because methods usually require additional information to do their job . This information is provided in brackets . function title() No additional information is needed , So the brackets after it are empty .

title() Show each word in uppercase , Change the initial of each word to uppercase . It's very useful , Because you often need to think of names as information . for example , You may want the program to be worth Ada 、ADA and ada Treat as the same name , And show them all as Ada .

There are several other useful ways to handle case . for example , To change the string to all uppercase or lowercase , You can do it like this :
name = "Come on Bcbx"
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The output of this code is as follows :

When storing data , Method lower() It is useful to . A lot of times , You can't rely on users to provide the correct case , So you need to convert the string to lowercase first , Store them again . When you need to display this information later , Then convert it to the most appropriate case .


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