Roshan Book

My Tech Notebook

Python tutorial 14- Tuples and Lists


t=1,2,3 or t=tuple(range(25))

t[-1] returns last element

len[t] gives length of the tuple

min[t] gives minimum value of tuple

max[t] gives maximum value of the tuple

Tuple is deifned by ,


Lists are created with square bracket

same methods as tuple

You can also change things


to change a position x[10]= 45

Why to use tuple

smaller class, simpler, faster, don’t allow you to change stuff

Operations in tuples and lists



list_x.append(100) – put 100 at the end of it

len(x) – length og lust x

x.extend(range(20)) – range 20 added to end of list x

x.insert(0,25) – insert 25 at positon 0

x.remove(12) – remove element with value 12

del x[12] – delete index 12

x.pop() – remove last value of the list and return it

x.pop(0) – pop from beginning

similarly x.pop(index) – remove that index value

# Dictionaries

Python verison of associative arrays

Created with curly braces


another way



you can say d=dict(one=1,two=2,**x)

This addds dict x into dict d

# to iterate

for k in d : print(k ) – prints all keys

for k, v in d.items() : print(k,v) – gives key and value

x.get(‘three’,’not found’) – gives three key value or give some default value if not there

del x[‘four’] – del key four

x.pop(‘five’) – remove and returns index five

You could store dic , tuple inside dictionary

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