Indexing And Slicing Strings
Strings use indexes and slices just like lists . >>> spam = 'Hello, world!' >>> spam[0] 'H' >>> spam[-1] '!' >>> spam[0:5] 'Hello' >>> spam[:5] 'Hello' >>> spam[7:] 'world!'
python
islower()
Returns True if string has at least one letter and all characters are lowercase, otherwise returns False. >>> spam 'Hello, world!' >>> spam.islower() False >>> 'abc12345'.islower() True >>> '12345'.islower() False
isupper()
Returns True if string has at least one letter and all characters are uppercase, otherwise returns false. >>> spam = 'Hello, world!' >>> spam.isupper() False >>> 'HELLO'.isupper() True >>> '12345'.isupper() False
isX() Methods
Similar to islower() and isupper() there are many isX() type methods. isalpha() Returns True if the string consists only of letters and isn’t blank isalnum() Returns True if the string consists only of letters and numbers and is not blank isdecimal() Returns True if the string consists only of numeric characters and is not blank isspace() Returns True if the string consists only of spaces, tabs, and newlines and is not blank istitle() Returns True if the string consists only of words that begin with an uppercase letter followed by only lowercase letters Note, the isX() methods are helpful for input validation. ...
items()
The items() method returns tuples of key value pairs. >>> spam {'color': 'red', 'age': 42} >>> for i in spam.items(): ... print(i) ... ('color', 'red') ('age', 42) You can use the multiple assignment trick in a for loop to assign the key and value to separate variables. >>> spam {'color': 'red', 'age': 42} >>> for k, v in spam.items(): ... print('Key: ' + k + ' Value: ' + str(v)) . ...
Jinja
Jinja # Jinja Official Docs Jinja Template Designer
join()
Allows you to join a list of strings into a single string. >>> ', '.join(['cats', 'rats', 'bats']) 'cats, rats, bats'
keys()
The keys() method returns a list of keys from a dictionary . @>>> spam {'color': 'red', 'age': 42} @>>> for k in spam.keys(): @... print(k) @... color age Can pass to list() function to create list from output
Keyword Arguments
Most arguments are identified by their position in the function call. random.randint(1, 10) # random.randint(10, 1) causes an error. # Order of arguments matters Keyword arguments are identified by the keyword put before them in the function call. Keyword arguments are often optional parameters. See: parameters arguments Example: print('Hello', end='') print('World') Output: HelloWorld Example: >>> print('cats', 'dogs', 'mice') cats dogs mice >>> print('cats', 'dogs', 'mice', sep=',') cats,dogs,mice Note how the print() function automatically separates strings with a ' ‘, but you can specify the field separator with sep=. ...
Learn Python
Resources # Curated list of awesome python frameworks, libraries, software and resources Awesome Python Cheat Sheets # Python Cheat Sheet Books # Automate the Boring Stuff Learn Python the Hard Way Python Crash Course by Eric Matthes Recommended by David (has root) Biniek Think Python Introducing Python Video Series # Learn Python with Socratica Recommended by Noah A. ...