2.datatypes.py

# Python Numbers
print('>>>> Python Numbers >>>>')
a = 5
print(a, "is of type", type(a))

a = 2.0
print(a, "is of type", type(a))

a = 1 + 2j
print(a, "is complex number?", isinstance(1 + 2j, complex))

# Python String
print('\n')
print('>>>> Python String >>>>')
s = "This is a string"
print(s)

s = "This is a string 1+3j, 323645 3.56"
print(s)

s = '''A multiline
string'''
print(s)

# String slicing
print("s[0:3] = ", s[0:3])
print("s[5:] = ", s[5:])
print("s[0:8] = ", s[0:8])
print("s[:8] = ", s[:8])

# String is immutable
# s[1] = 'n'
# TypeError: 'str' object does not support item assignment

# Python List
print('\n')
print('>>>> Python List >>>>')
a = [1, 2.2, 'python', 1 + 3j, 'python']
print(a)

# List slicing
b = [5, 10, 15, 20, 25, 30, 35, 40]
print("b[2] = ", b[2])
print("b[0:3] = ", b[0:3])
print("b[5:] = ", b[5:])

# Lists are mutable, meaning, the value of elements of a list can be altered.
a = [1, 2, 3]
a[2] = 4
print(a)

# Python Tuple
print('\n')
print('>>>> Python Tuple >>>>')
t = (5, 'program', 1 + 3j, 1.6)
print("t = ", t)

# Tuple slicing
print("t[1] = ", t[1])
print("t[0:3] = ", t[0:3])

# Tuples are immutable
# t[0] = 10
# TypeError: 'tuple' object does not support item assignment

# Python Set
print('\n')
print('>>>> Python Set >>>>')
a = {5, 2, 3, 1, 4}
print("a = ", a)
print(type(a))

a = {5, 2, 3, 1, 4, 2, 2, 2, 4, 5}
print("a = ", a)
print(type(a))

a = {5, 2, 3, 1, 4, 2, 2, 2, 4, 5, 'A', 'B', 'C'}
print("a = ", a)
print(type(a))


a = {5, 2, "string", 3 + 4j, 3.4}
print("a = ", a)
print(type(a))

a = {1, 2, 3}
# print("a[1] = ", a[1])
# TypeError: 'set' object does not support indexing

# Set slicing
# print("a[1] = ", a[1])
# TypeError: 'set' object does not support indexing

# Python Dictionary
print('\n')
print('>>>> Python Dictionary >>>>')
d = {1: 'value', 'key': 2}
print(type(d))
print("d[1] = ", d[1])
print("d['key'] = ", d['key'])

d = {'key1': 'value1', 'key2': 'value2'}
print(type(d))
print("d['key1] = ", d['key1'])
print("d['key2'] = ", d['key2'])

d['key2'] = 'value3'
print("d : ", d)

# Dictionary slicing
d = {'key1': 'value1', 'key2': 'value2', 'key3': 'value3', 'key4': 'value4', 55: 66, 77: 88}
print("d : ", d)
# print("d[0:3] = ", d[0:3])
# TypeError: unhashable type: 'slice'