Python for Bioinformatics

This Jupyter notebook is intented to be used alongside the book Python for Bioinformatics

Chapter 2: First Steps with Python



In [2]:

    
print('Hello World!')









    



Hello World!



In [3]:

    
print("Hello", "World!")









    



Hello World!



In [4]:

    
print("Hello","World!",sep=";")









    



Hello;World!



In [5]:

    
print("Hello","World!",sep=";",end='\n\n')









    



Hello;World!



In [1]:

    
name = input("Enter your name: ")
name









    



Enter your name: Seba






    Out[1]:





'Seba'



In [2]:

    
1+1









    Out[2]:





2



In [3]:

    
'1'+'1'









    Out[3]:





'11'



In [4]:

    
"A string of " + 'characters'









    Out[4]:





'A string of characters'



In [5]:

    
'The answer is ' + 42









    



---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-5-defa453cb41a> in <module>()
----> 1 'The answer is ' + 42

TypeError: Can't convert 'int' object to str implicitly



In [6]:

    
'The answer is ' + str(42)









    Out[6]:





'The answer is 42'



In [1]:

    
'The answer is {0}'.format(42)









    Out[1]:





'The answer is 42'



In [2]:

    
number = 42
'The answer is {0}'.format(number)









    Out[2]:





'The answer is 42'

Mathematical Operations



In [14]:

    
12*2









    Out[14]:





24



In [13]:

    
30/3









    Out[13]:





10.0



In [12]:

    
2**8/2+100









    Out[12]:





228.0



In [15]:

    
10/4









    Out[15]:





2.5



In [16]:

    
10//4









    Out[16]:





2

BATCH MODE

Listing 2.1: hello.py: A “Hello World!” program



In [7]:

    
print("Hello World!")









    



Hello World!

Listing 2.2: hello2.py: Hello World! with shebang



In [8]:

    
#!/usr/bin/python
print("Hello World!")









    



Hello World!

Listing 2.3: Hello World! with comments



In [9]:

    
#!/usr/bin/env python
# The next line prints the string "Hello World!"
print("Hello World!")









    



Hello World!