Python Day -> 1

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#Python Basic

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print('I am not bad')

I am not bad

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print("I am not bad")

I am not bad

In [4]:

4 * 5

Out[4]:

20

In [5]:

2 - 1

Out[5]:

1

In [6]:

2 * 4

Out[6]:

8

In [7]:

6 / 2

Out[7]:

3.0

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int(6 / 2)

Out[8]:

3

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# Variable 

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'''
# Python reserved keyword. These below list you can not assign varible name.
False None True
and exec not
as finally or
assert for pass
break from print
class global raise
continue if return
def import try
del in while
elif is with
else lambda yield
except
'''

Out[15]:

'\n# Python reserved keyword. These below list you can not assign varible name.\nFalse\tNone\tTrue\nand\texec\tnot\nas\tfinally\tor\nassert\tfor\tpass\nbreak\tfrom\tprint\nclass\tglobal\traise\ncontinue\tif\treturn\ndef\timport\ttry\ndel\tin\twhile\nelif\tis\twith\nelse\tlambda\tyield\nexcept\n'

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a = 2

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b = 3

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a + b

Out[18]:

5

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c = a + b

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print (c)

5

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#Data type

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type(a)

Out[32]:

int

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d = 3.14

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type(d)

Out[34]:

float

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e = 'power'

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type(e)

Out[36]:

str

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f = "BH"

In [38]:

type(f)

Out[38]:

str

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g = True 

In [40]:

type(g)

Out[40]:

bool

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#Other data type
'''
 long, complex, unicode, list, tuple, set, dict 
'''

Out[41]:

'\n long, complex, unicode, list, tuple, set, dict \n'

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long = 1

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long

Out[43]:

1

In [44]:

#Data Input

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a = input()

15

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b = input()

10

In [48]:

a + b

Out[48]:

'1510'

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#Type casting
'''
int() Integer cast
float() float cast
str() String cast
tuple() Tuple cast
list() List cast
set()  Set cast
dict()  Dictonary cast
'''

Out[49]:

'\nint()\tInteger cast\nfloat()\tfloat cast\nstr()\tString cast\ntuple()\tTuple cast\nlist()\tList cast\nset()\t Set cast\ndict()\t Dictonary cast\n'

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a = 5

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type(a)

Out[51]:

int

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a = str(a)

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type(a)

Out[53]:

str

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#Input 

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a = input()

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a = int(a)

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-68-8941b20ea7e0> in <module>
----> 1 a = int(a)

ValueError: invalid literal for int() with base 10: ''

In [69]:

b = 10

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b = int(b)

In [58]:

a + b

Out[58]:

25

In [60]:

a = int(input())

15

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b = int(input())

10

In [62]:

a,b = input().split()

15 10

In [63]:

a

Out[63]:

'15'

In [64]:

b

Out[64]:

'10'

In [65]:

type(b)

Out[65]:

str

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a,b = map(int, input().split())

15 10

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a + b

Out[72]:

25

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# Arithmetic opertaor 7 type

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'''
+ add op
- subtraction op
* multi op
/ divison op
% modulas op
** exponent op
// floor divison op
'''

Out[106]:

'\n+ add op\n- subtraction op\n* multi op\n/ divison op\n% modulas op\n** exponent op\n// floor divison op\n'

In [107]:

2 + 2

Out[107]:

4

In [108]:

3 - 1

Out[108]:

2

In [109]:

2 * 2

Out[109]:

4

In [110]:

4 / 2

Out[110]:

2.0

In [111]:

4 // 2

Out[111]:

2

In [112]:

10 / 3

Out[112]:

3.3333333333333335

In [113]:

10 % 3

Out[113]:

1

In [114]:

3 ** 2

Out[114]:

9

In [115]:

math.pow(3, 2)

Out[115]:

9.0

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import math

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math.pow(3,2)

Out[117]:

9.0

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# Comparison Operator 6 type

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'''
== equal equal 
!= not equal
> Greater than
< less than
>= Greater than or equal operator
<=less than or equal operator
'''

Out[120]:

'\n==\tequal equal \n!=\tnot equal\n>\tGreater than\n<\tless than\n>=\tGreater than or equal operator\n<=less than or equal operator\n'

In [121]:

2 == 2

Out[121]:

True

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2 != 2

Out[122]:

False

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5 < 3

Out[123]:

False

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5 > 3

Out[124]:

True

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5 <= 5

Out[125]:

True

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5 >= 3

Out[126]:

True

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5 > 5 

Out[127]:

False

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# Assignment Operator 5 type

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'''
=
+=
-=
*=
/=
'''

Out[129]:

'\n=\n+=\n-=\n*=\n/=\n'

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a = 5

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a = a + 2

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a

Out[136]:

7

In [137]:

a += 2

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a

Out[138]:

9

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# Logical Operator 3 type

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'''
and -----> && 
or -------> ||
not ------> !
'''

Out[140]:

'\nand -----> && \nor -------> ||\nnot ------> !\n'

In [141]:

2 == 2 && 3==3

  File "<ipython-input-141-744ec8abfd5d>", line 1
    2 == 2 && 3==3
            ^
SyntaxError: invalid syntax

In [142]:

2 == 2 and  3 == 3

Out[142]:

True

In [143]:

2 == 2 or 3 == 4

Out[143]:

True

In [144]:

3 == 4 or 2 == 2

Out[144]:

True

In [145]:

'''
True and True = True
True and False = False
False and True = False 
False and False = False
---------------------------
True or True = True
True and False = True 
False and true = True 
False and False = False
'''

Out[145]:

'\nTrue and True = True\nTrue and False = False\nFalse and True = False \nFalse and False = False\n---------------------------\nTrue or True = True\nTrue and False = True \nFalse and true = True \nFalse and False = False\n'

In [146]:

2 == 5

Out[146]:

False

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 not 2 == 5

Out[147]:

True

In [148]:

'''
not (False) = True 
not (True) = Flase
'''

Out[148]:

'\nnot (False) = True \nnot (True) = Flase\n'

In [149]:

# Membership Operrator 2 type

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'''
in
not in
'''

Out[150]:

'\nin\nnot in\n'

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a = 'Bangladesh'

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b = 'desh'

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a in b 

Out[153]:

False

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b in a

Out[154]:

True

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b = 'desh'

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c = 'desh'

In [157]:

b in c

Out[157]:

True

In [158]:

c in b 

Out[158]:

True

In [159]:

# Identity Oprator 2 type

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'''
is 
is not
'''

Out[161]:

'\nis \nis not\n'

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a = 'Bangladesh'

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b = 12

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a is b

Out[164]:

False

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a is not b

Out[165]:

True

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a = 1

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b = 1

In [168]:

a is b

Out[168]:

True

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a is not b

Out[169]:

False

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a = 257

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b = 257

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b is a

Out[172]:

False

In [173]:

a is b 

Out[173]:

False

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a = 256 

In [175]:

b = 256 

In [176]:

a is b

Out[176]:

True

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b is a 

Out[177]:

True

In [178]:

# Python resever 256 intger in cache memory data range between [-5, 256]. is operator range working [-5,256]

In [182]:

# Comment in Python
'''
# ##########
'''

Out[182]:

'\n# ##########\n'

In [183]:

a = 15  # a is a dividend. This comment name is inline commment 

In [184]:

# a is an int variable
... # This is another comment.
...

In [185]:

# a is an int variable
... # This is another comment.
#This comment name is 'Block comment'
...

In [186]:

# a is an int variable
... # This is another comment.
This comment name is 'Block comment'
...

  File "<ipython-input-186-6ec8084bbcf3>", line 3
    This comment name is 'Block comment'
               ^
SyntaxError: invalid syntax

In [187]:

"""
This comment name is doc string comment.Also this one is String.
"""

Out[187]:

'\nThis comment name is doc string comment.Also this one is String.\n'

In [188]:

'''
another way doc comment 
'''

Out[188]:

'\nanother way doc comment \n'

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