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→Files
== Files ==
== Files ==
'''Counting lines in a file'''
<source lang="python">
fhand = open("words.txt")
count = 0
for line in fhand:
count = count + 1
print "line count", count
</source>
'''Reading the whole file'''
<source lang="python">
fhand = open("words.txt")
inp = fhand.read() # reads the whole file into memory
print len(inp)# returns the number of characters in a file
print inp # prints the whole file
</source>
'''Searching through a file'''
<source lang="python">
fhand= open("mbox-short.txt")
for line in fhand:
# line = line.rstrip()
if line.startswith("From:"):
line = line.rstrip() # better here
print line
</source>
'''File names and paths'''
<source lang="python">
fname = raw_input("Enter a file name: ")
if fname[0:2] == "~/": #Check to see if it starts with a ~ and a slash
#If it doesn't start with the ~/, then
#the user could be referring to a valid file
#like "~.py" (I checked: it is possible.)
#notice below replace is valid on Mac OSX only (and not a good approach overall, cause not portable at all)
fname = fname.replace('~',"/Users/"+raw_input("Enter your short user name: "),1)
workingfname = fname.replace("\\",'') #This for proper escaping of a valid folder named '~' as '\~', you can also use './~' as Python automatically escapes for you.
#go back to normal program now
handle = open(workingfname,'r') # . . .
for line in handle:
print line
print "\n"+("That was "+fname+".").center(40)
</source>
== Class ==
== Class ==
== MySQLdb ==
== MySQLdb ==
== os.system() ==
== os.system() ==