###
###  Python Basics 
###
###----------------------------------------

"""
Basic Practice: http://codingbat.com/python
More Mathematical (and Harder) Practice: https://projecteuler.net/archives
List of Practice Problems: http://www.codeabbey.com/index/task_list
SubReddit Devoted to Daily Practice Problems: https://www.reddit.com/r/dailyprogrammer
A very tricky website with very few hints and tough problems http://www.pythonchallenge.com/
"""

#--- Check current working directory
import os

path = os.getcwd()
print(path)

print(type(path))

  # os.chdir("/Users/username/Folder1")  # change dir
  # os.chdir("C:\\Users\\UserName\\Folder1")




#--- Slice Assignment Example
#    https://stackoverflow.com/questions/4081217/how-to-modify-list-entries-during-for-loop

a = [1, 3, 5]
b = a
print(a)
print(b)
a = [x + 2 for x in a]
print(b is a)
print(a)
print(b)   # b is not same as a


a = [1, 3, 5]
b = a
print(a)
print(b)
a[:] = [x + 2 for x in a]
print(b is a)
print(a)
print(b)   # b IS same as a!



#--- I/O with Python
Infile = open('SOA-Orig-Porb.txt')
Infile.read()   # one single string of everything in the file.
Infile.read()   # returns nothing because the cursor is at the EoF
Infile.seek(0)  # reset cursor
Infile.read()   # now it can read again

Infile.seek(0)
Infile.readlines() # each line is separate entry in one list

Infile.close()



#- I/O Another way (you don't have to .close() this way)
with open('SOA-Orig-Prob.txt', mode='r') as Infile:
    contents  = Infile.read()
with open('SOA-Orig-Prob-02.txt', mode='w') as Outfile1:
    Outfile1.write(contents)


#- I/O as list
with open('SOA-Orig-Prob.txt', mode='r') as Infile:
    contents = Infile.readlines()
with open('SOA-Orig-Prob-03.txt', mode='w') as Outfile:
    #Outfile.write(contents2)  # gives error because it's list, not string
    str01  = ' '.join(map(str, contents))
    Outfile.write(str01)