In [1]: print "Hello World!" # Works on python 2.x
Hello World!
In [2]: print("Hello World!") # Works on python 2.x, 3.x
Hello World!#!/usr/bin/env python
print("Hello World!")$ python hello_world.py
Hello World!
$ chmod +x hello_world.py
$ ./hello_world.py
Hello World!In [1]: a = 2014
In [2]: a
Out[2]: 2014
In [3]: b = 9999999999999999999999999999999999999999
In [4]: b
Out[4]: 9999999999999999999999999999999999999999LIn [1]: a = 3.14159
In [2]: a
Out[2]: 3.14159
In [3]: b = 9876543210.123456789
In [4]: b
Out[4]: 9876543210.123457
In [5]: c = 1111111113333333333999999999999.1234
In [6]: c
Out[6]: 1.1111111133333333e+30In [1]: c = 3 + 4j
In [2]: c
Out[2]: (3+4j)
In [3]: abs(c)
Out[3]: 5.0
In [4]: c.imag
Out[4]: 4.0
In [5]: c.real
Out[5]: 3.0In [1]: t = True
In [2]: f = not t
In [3]: f or t
Out[3]: True
In [4]: f and t
Out[4]: False
In [5]: a = False
In [6]: b = True
In [7]: c = True
In [8]: (a and b) or c
Out[8]: True
In [9]: a and (b or c)
Out[9]: False"Hello World!" ---> String
In [1]: s = "Hello Strings!"
In [2]: print(s)
Hello Strings!
In [3]: print(s[0] + s[9] + " Guys!")
Hi Guys!
In [4]: len(s)
Out[4]: 14
In [5]: s.index('i')
Out[5]: 9
In [6]: "String" == 'String' == """String""" == '''String'''
Out[6]: TrueIn [1]: s = "This is a string"
In [2]: s[5] = 'N' ---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-2-fd292d5d9b41> in <module>()
----> 1 s[5] = 'N'
TypeError: 'str' object does not support item assignmentIn [1]: a = 'Hello World'
In [2]: a.startswith('Hell')
Out[2]: True
In [3]: a.endswith('ld')
Out[3]: True
In [4]: a.upper()
Out[4]: 'HELLO WORLD'
In [5]: a.lower()
Out[5]: 'hello world'
In [6]: a.<<press Tab twice>>
a.capitalize a.encode a.format a.isdigit a.isupper a.lstrip
a.rindex a.rstrip a.strip a.upper a.center a.endswith
a.index a.islower a.join a.partition a.rjust a.split
a.swapcase a.zfill a.count a.expandtabs a.isalnum a.isspace
a.ljust a.replace a.rpartition a.splitlines a.title a.decode
a.find a.isalpha a.istitle a.lower a.rfind a.rsplit
a.startswith a.translateIn [1]: a = "roHIt gUPTa"In [2]: a.title?
Type: builtin_function_or_method
String form: <built-in method title of str object at 0x7f1122e0a4b0>
Docstring:
S.title() -> string
Return a titlecased version of S, i.e. words start with uppercase
characters, all remaining cased characters have lowercase.In [3]: a.title()
Out[3]: 'Rohit Gupta'In [1]: x, y = 1, 1.234
In [2]: "x is %s, y is %s" % (x, y)
Out[2]: 'x is 1, y is 1.234'
In [3]: "x is %d, y is %f" % (x, y)
Out[3]: 'x is 1, y is 1.234000'
In [4]: "x is %d, y is %.1f" % (x, y)
Out[4]: 'x is 1, y is 1.2'Details: click here
In [1]: 1786 % 12 # Mod operator
Out[1]: 10
In [2]: 45 % 2
Out[2]: 1
In [3]: 864675 % 10
Out[3]: 5
In [4]: 3124 * 126789 # Multiplication
Out[4]: 396088836
In [5]: 2 ** 3 # Exponent
Out[5]: 8
In [6]: big = 1234567891234567890 ** 3
In [7]: verybig = big * big * big * bigIn [8]: 17 / 2 # Division
Out[8]: 8
In [9]: 17 / 2.0
Out[9]: 8.5
In [10]: 17.0 / 2
Out[10]: 8.5
In [11]: 17.0 / 8.5
Out[11]: 2.0
In [12]: a = 7546
In [13]: a += 1 # -=, *=, /=, %=, **= also available
In [14]: a
Out[14]: 7547In [18]: s = "Hello"
In [19]: p = "World"
In [20]: s + p
Out[20]: 'HelloWorld'
In [21]: s * 4
Out[21]: 'HelloHelloHelloHello' In [22]: s * s
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-22-d39d6d7c295f> in <module>()
----> 1 s * s
TypeError: can't multiply sequence by non-int of type 'str'In [23]: p, z, n = 1, 0, -1
In [24]: p == n
Out[24]: False
In [25]: p >= n
Out[25]: True
In [26]: n < z < p
Out[26]: True
In [27]: p + n != z
Out[27]: FalseIn [28]: int(17 / 2.0)
Out[28]: 8
In [29]: float(17 / 2)
Out[29]: 8.0
In [30]: str(17 / 2.0)
Out[30]: '8.5'
In [31]: round( 7.5 )
Out[31]: 8.0In [1]: a = raw_input() # raw_input() waits for user input.
100
In [2]: a
Out[2]: '100'
In [3]: a = raw_input('Enter a value: ') # Prompt string is optional.
Enter a value: 500 # All keystrokes are Strings!
In [4]: a = int(a) # int() converts string to int.
In [5]: a
Out[5]: 500
In [6]: print(a) # Output in stdout (terminal)
500
In [7]: %run -i hello_world.py # Execute python file
Hello World!In [1]: x = int(raw_input("Enter an integer: "))
Enter an integer: 5
In [2]: if x < 0:
...: print 'Be positive!'
...: elif x == 0:
...: print 'Zero'
...: elif x == 1:
...: print 'Single'
...: else:
...: print 'More'
...:
MoreIn [1]: a, b, c = 4, 5.2, 3+4jIn [1]: type(1)
Out[1]: int
In [2]: type(1.1)
Out[2]: float
In [3]: type(1.1+2.2j)
Out[3]: complex
In [4]: isinstance(1, int)
Out[4]: True
In [5]: isinstance(1.1, float)
Out[5]: True
In [6]: isinstance(1.1+2.2j, complex)
Out[6]: True
In [7]: abs(1.1+2.2j)
Out[7]: 2.459674775249769In [1]: a, b, c = 4, 5.2, 3+4j
In [2]: max = a
In [3]: if abs(max) < abs(b):
...: max = b
...:
In [4]: if abs(max) < abs(c):
...: max = c
...:
In [5]: print(max)
5.2