The index operator (Python uses square brackets to enclose the index) selects a single character from a string.
In strings, the characters are accessed by their position or index.
In lists and tuples, items are accessed by their position or index.
Characters are indexed left to right from position ‘0’ to position ‘13’. Positions are also named from right to left using negative numbers, where -1 is the rightmost index and so on.
List = [10,20,'apple',30,'mango',40] tuple = ['hello','pi','value','is',3.14]
a="hello students"b=['hello','pi','value','is',3.14]c=('hello','pi','value','is',3.14)l=a[2]print(l)lastcher=a[-1]print(lastcher)print(b[2])print(b[3-6])print(b[-2])print(c[0])print(c[-1])print(c[2-4])print(b[7-8])
count()The count method returns the number of times the argument occurred in the string/list upon which the method was used.
We cannot count how many times integer 2 occurred, but we can count how many times string ‘2’ occurred.
The count method works for lists too.
a="I have had an apple on my desk before!"print(a.count("e"))print(a.count("ha"))z=['atoms',4,'neutron',6,'proton',4,'electron',4,'electron','atoms']print(z.count("4"))print(z.count(4))print(z.count("a"))print(z.count("electron"))