sequence

Author: laibanasir

dictionaries.py

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+#dictionary
+student = {'Name' : 'Laiba',
+        'Age' : 19}
+
+#adding key-value pair
+student['Gender'] = 'Female'
+
+#deleting key-value pair
+#student.pop('Age')
+
+#clearing dictionary
+#student.clear()
+
+#updating values
+student['Name'] = 'Roma'

evenoddlambda.py

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+from functools import reduce
+
+#learning lambda (anonymous functions) , filter
+#even and odd filter
+
+nums = [2, 5, 2, 1, 6, 7, 5, 20, 99, 102]
+even_nums = list(filter(lambda n : n % 2 == 0, nums))
+odd_nums = list(filter(lambda n : n % 2 != 0, nums))
+print('Even numbers :', even_nums)
+print('Odd numbers :', odd_nums)
+
+#doubling odds and evens
+#using map
+#map replaces the values
+
+even_nums_double = list(map(lambda n : n * 2, even_nums))
+odd_nums_double = list(map(lambda n : n * 2, odd_nums))
+print('Double even numbers :', even_nums_double)
+print('Double odd numbers :', odd_nums_double)
+
+#import reduce from functools to use reduce 
+
+sum = reduce(lambda a, b : a + b, even_nums)
+product = reduce(lambda a, b : a * b, odd_nums)
+print('Sum of even numbers sequence :', sum)
+print('Product of odd numbers sequence :', product)

list.py

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+colors = ['blue', 'orange', 'green', 'grey', 'red']
+cars = ['bmw', 'mercedees']
+
+#lists
+#slicing
+colors_choice = colors[1:4] #(upto 4 , 4 not included)
+
+#append
+colors.append('yellow')
+
+#insert (needs index and element)
+colors.insert(2, 'cyan')
+
+#extend 
+colors.extend(colors_choice)
+
+#remove
+colors.remove('yellow')
+
+#reverse
+colors.reverse()
+
+#concatenation 
+concatenate = colors + cars
+
+#repetition
+repeat = cars * 3 #['bmw', 'mercedees', 'bmw', 'mercedees', 'bmw', 'mercedees']

sets.py

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+#sets
+integers = {1, 2, 3, 4, 5, 6, 6, 7} #repetitive elements will be considered once for eg 6 here
+real = {7, 8, 9}
+#sequence of unique elements
+
+#discard
+integers.discard(4)
+
+#union
+print(integers|real)
+
+#intersection 
+print(integers & real)
+
+#difference (uncommon elements)
+print(integers - real)
+print(real - integers)
+
+#symmetric difference (union of uncommon diefference) (xor operator , caret symbol ^)
+print(integers ^ real)
+
+#converting list into set
+list_integers = [1, 1, 2, 3, 4, 5, 6, 6, 7, 8, 9, 9]
+set_integers = set(list_integers)
+print(set_integers)
+tuple_integers = tuple(list_integers)

strings.py

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+canada = 'Keep the red flag flying high'
+
+#length
+size = len(canada)
+
+#indexing
+index_of_f = canada.index('f')
+
+#count
+count_of_f = canada.count('f')
+
+#slicing
+slice_keep = canada[:4]
+
+#upper case
+upper_canada = canada.upper()
+
+#repetition
+repeat_canada = canada * 2
+
+#concatenation
+concatenate_canada = 'Canada' + canada
+
+#membership testing
+#if 'z' not in canada: 
+#    print('Its not an element')

tuple inside a list.py

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+sports = [('football', 'cricket', 'badminton', 'hockey'), 
+         ('chess', 'ludo', 'table tennis')]
+
+chess = sports[1][0]
+
+points = [(1, 3), (2, 5), (3, 7)]
+points.append((4, 9))
+points.remove((1, 3))

tuples.py

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+#tuples
+outdoor = ('football', 'cricket', 'badminton', 'hockey')
+indoor = ('chess', 'ludo', 'table tennis')
+
+#indexing
+fav_outdoor = outdoor[0]
+fav_indoor = indoor[2]
+
+#slicing 
+difficult_outdoor = outdoor[2:4]
+difficult_indoor = indoor[1:3]
+
+#concatenation
+sports = outdoor + indoor
+
+#repetition 
+outdoor_more = outdoor * 3 
+
+#count
+number = outdoor.count('football')
+
+#length
+size = len(outdoor)