![str = 'Hello World!'
print(str) # Prints complete string
print(str[0]) # Prints first character of the string
print(str[2:5]) # Prints characters starting from 3rd to
5th
print(str[2:]) # Prints string starting from 3rd
character
print(str * 2) # Prints string two times
print(str + "TEST") # Prints concatenated string](https://image.slidesharecdn.com/python001-160613155839/85/Python001-13-320.jpg)
Python001
- 2. What is Python? − Python is a high-level, general-purpose language. The first release of Python was 1991. What can we do with python? 1. Unix and Linux System administration 2. Web programming with Django, TurboGears, TurboGears, Flask, Pyramid etc. 3. Artificial Intelligence 4. Scientific Research 5. Game Programming 6. Natural Language Processing 7. Image Processing 8. Machine Learning 9. etc.
- 3. https://www.python.org/downloads/ − Python 3.5.1 − Python 2.7.11
- 4. print “hello” # does not work in 3 3 / 2 = 1.5 # in 3 3/2=1 # in 2 3.0/2.0 = 1.5 # in 2 For more details - − https://wiki.python.org/moin/Python2orPython3
- 5. pip is a package management system used to install and manage software packages written in Python. PIP stands for Pip Installs Python or PIP Installs Packages Pip installation − https://pip.pypa.io/en/stable/installing/ Python Package Index − pypi.python.org
- 6. .py is the file extension No line ending semi-colon (;) No brackets!!! Indentation is everything − 4 spaces or 1 tab # single line comment ''' multi-line comment '''
- 7. IDLE (Integrated DeveLopment Environment or Integrated Development and Learning Environment) is an integrated development environment for Python PyCharm Sublime Text Notepad++
- 8. print("hello world") Compile and run $ python hello.py
- 9. counter = 100 # An integer assignment miles = 1000.0 # A floating point name = "Shahjalal" # A string print(counter) print(miles) print(name)
- 10. counter = 100 miles = 1000.0 name = "Shahjalal" print(counter) print(miles) print(name) counter, miles, name = 100, 1000.0, "Shahjalal" print(counter) print(miles) print(name)
- 12. Python supports four different numerical types − − int (signed integers) − long (long integers, they can also be represented in octal and hexadecimal) − float (floating point real values) − complex (complex numbers) Here are some examples of numbers − − Int - 10 − Long - 51924361L − Float – 0.0 − Complex - 3.14j
- 13. str = 'Hello World!' print(str) # Prints complete string print(str[0]) # Prints first character of the string print(str[2:5]) # Prints characters starting from 3rd to 5th print(str[2:]) # Prints string starting from 3rd character print(str * 2) # Prints string two times print(str + "TEST") # Prints concatenated string
- 14. Coming next Lists, Tuples and Dictionary