print('hello, world')
hello, world
print('bye, class')
bye, class
x = 'hello, bun'
x
'hello, bun'
x.upper()
'HELLO, BUN'
'hello bun'.upper()
'HELLO BUN'
id(x)
1606021169264
x
'hello, bun'
x = 784975
id(x)
1606022268080
x = 7897248957897589427987428579824759245678924765982479874265987249679
x
7897248957897589427987428579824759245678924765982479874265987249679
id(x)
1606022325232
x = 78
print('hello ' + x)
Traceback (most recent call last):
  File "<pyshell#14>", line 1, in <module>
    print('hello ' + x)
TypeError: can only concatenate str (not "int") to str
print('hello ' + str(x))
hello 78
print('hello ' + str(x))
hello 78

filled_dict = {"one": 1, "two": 2, "three": 3}
filled_dict["one"]
1