COMMANDS
pip
freeze
>
requirments
.txt
|
|
|
STRING METHODS
|
String to uppercase |
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String to lowercase |
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Occurrences of element |
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Strip whitespaces |
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Returns True if |
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Position of first occurrence |
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Returns True if all are digits |
SLICING
list
[
Initial
: End
: IndexJump
]
|
my_list
[1:3]
Select items at index 1 and 2 |
my_list
[1:]
Select items after index 0 |
my_list
[:3]
Select items before index 3 |
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LISTS
|
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Adds 6 to the end |
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Adds 6 at index position of 0 |
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Removes 6 |
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Removes the last item |
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Removes all the items |
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Returns the index of first 8 |
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Sorts the list |
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Reverses the list |
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Returns a copy of the list |
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Deletes elements in range |
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Extend existing list with list b
|
ADVANCE LISTS
Removing duplicates
Use dict
.fromkeys()
function to convert list into dictionary with list elements as keys. Then convert the dictionary back to list.
list
=[‘a’, ’b’, ’c’, ’b’, ’a’]
list_2
= list
(dict
.fromkeys
(list
))
Filtering a list
list
=
[item for item in m_list if item > 20]
Combining lists
Each item from list A is combined with corresponding elements from list B in the form of a tuple.
comb_list
=
list
(zip
(list_1, list_2
))
Finding the most common item
list
= ['a','a','a','d','d','e']
frequent
=
max
(set
(list),
key=
list
.count)
Flatten a list of lists
comprehension-to convert a list of lists into single list.
list=
[item
for
List
in
listOflist
for
item
in
List
] |
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PYTHON
this is it if than. |
are you serious? |
RANGE
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Returns sequence from 0 to 4
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Returns a sequence form 2000 to 2017
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Returns seq. from 0 to 10 with increment of 2
|
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Returns a sequence from 0 to -9
|
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Returns a list from 0 to 4
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