#
# working with files
#
# copy files "study" and "magnetism" to Python25 folder

from string import *

# (A) open file and show contents
filename = raw_input("Enter file name: ")

infile = open(filename,'r')
x = infile.read()           # read complete file into a variable

print
print "%s contains the string:\n%s\n\nwhen printed:\n\n%s" % (filename,[x],x)

# EXTRA PRINT AND PAUSE
pause = raw_input("(pausing... hit enter to continue) ")

# close file and reopen
infile.close()
infile = open(filename,'r')

# (B) read a line at a time
m = input("\nHow many lines in file? ")
for i in range(m):
    x = infile.readline()
    print "Line %d is:\n%s" % (i+1,[x])

# EXTRA PRINT AND PAUSE
pause = raw_input("\n(pausing... hit enter to continue) ")

# close file and reopen
infile.close()
infile = open(filename,'r')

# (B.2) print each line
print
for i in range(m):
    x = infile.readline()
    print x

# EXTRA PRINT AND PAUSE
pause = raw_input("(pausing... hit enter to continue) ")

# close file and reopen
infile.close()
infile = open(filename,'r')

# (B.3) print each line without last character of the line
print
for i in range(m):
    x = infile.readline()
    print x[:-1]

# EXTRA PRINT AND PAUSE
pause = raw_input("\n(pausing... hit enter to continue) ")

# close file and reopen
infile.close()
infile = open(filename,'r')

# (C) loop through file in a couples ways
print
for line in infile.readlines():
    print line[:-1]

# EXTRA PRINT AND PAUSE
pause = raw_input("\n(pausing... hit enter to continue) ")

# close file and reopen
infile.close()
infile = open(filename,'r')

# (C.2) using file variable
print
for line in infile:
    print line[:-1]
    
# EXTRA PRINT AND PAUSE
pause = raw_input("\n(pausing... hit enter to continue) ")

# close file and reopen
infile.close()
infile = open(filename,'r')

# (D) write an upper case version of file
outfile = open("OUT"+filename,'w')
for line in infile:
    x = upper(line[:-1])+'\n'
    outfile.write(x)

outfile.close()

# close file and reopen output file
infile.close()
infile = open("OUT"+filename,'r')

# print output file
print
for line in infile:
    print line[:-1]
    
# EXTRA PRINT AND PAUSE
pause = raw_input("\n(pausing... hit enter to continue) ")

infile.close()