Python 3.5.2 (default, Nov 17 2016, 17:05:23)

 [GCC 5.4.0 20160609] on linux

 Type "copyright", "credits" or "license()" for more information.

 >>> import os

 >>> os.getcwd()

 '/home/user'

 >>> os.chdir('/home/user/project/python_model/HeadFirstPython/chapter3')

 >>> os.getcwd()

 '/home/user/project/python_model/HeadFirstPython/chapter3'

 >>> man=[]

 >>> other=[]

 >>> try:

     data=open('sketch.txt')

     for each_line in data:

         try:

             (role,line_spoken)=each_line.split(':',1)

             line_spoken=line_spoken.strip()

             if role=='Man':

                 man.append(line_spoken)

             elif role=='Other Man':

                 other.append(line_spoken)

         except ValueError:

             pass

     data.close()

 except IOError:

     print('The datafile is missing!')

 >>> print(man)

 ['Is this the right room for an argument?', "No you haven't!", 'When?', "No you didn't!", "You didn't!", 'You did not!', 'Ah! (taking out his wallet and paying) Just the five minutes.', 'You most certainly did not!', "Oh no you didn't!", "Oh no you didn't!", "Oh look, this isn't an argument!", "No it isn't!", "It's just contradiction!", 'It IS!', 'You just contradicted me!', 'You DID!', 'You did just then!', '(exasperated) Oh, this is futile!!', 'Yes it is!']

 >>> print(other)

 ["I've told you once.", 'Yes I have.', 'Just now.', 'Yes I did!', "I'm telling you, I did!", "Oh I'm sorry, is this a five minute argument, or the full half hour?", 'Just the five minutes. Thank you.', 'Anyway, I did.', "Now let's get one thing quite clear: I most definitely told you!", 'Oh yes I did!', 'Oh yes I did!', 'Yes it is!', "No it isn't!", 'It is NOT!', "No I didn't!", 'No no no!', 'Nonsense!', "No it isn't!"]

 >>> 

 help(open)

 Help on built-in function open in module io:

 open(file, mode='r', buffering=-1, encoding=None, errors=None, newline=None, closefd=True, opener=None)

     Open file and return a stream.  Raise IOError upon failure.

     file is either a text or byte string giving the name (and the path

     if the file isn't in the current working directory) of the file to

     be opened or an integer file descriptor of the file to be

     wrapped. (If a file descriptor is given, it is closed when the

     returned I/O object is closed, unless closefd is set to False.)

     mode is an optional string that specifies the mode in which the file

     is opened. It defaults to 'r' which means open for reading in text

     mode.  Other common values are 'w' for writing (truncating the file if

     it already exists), 'x' for creating and writing to a new file, and

     'a' for appending (which on some Unix systems, means that all writes

     append to the end of the file regardless of the current seek position).

     In text mode, if encoding is not specified the encoding used is platform

     dependent: locale.getpreferredencoding(False) is called to get the

     current locale encoding. (For reading and writing raw bytes use binary

     mode and leave encoding unspecified.) The available modes are:

     ========= ===============================================================

     Character Meaning

     --------- ---------------------------------------------------------------

     'r'       open for reading (default)

     'w'       open for writing, truncating the file first

     'x'       create a new file and open it for writing

     'a'       open for writing, appending to the end of the file if it exists

     'b'       binary mode

     't'       text mode (default)

     '+'       open a disk file for updating (reading and writing)

     'U'       universal newline mode (deprecated)

     ========= ===============================================================

     The default mode is 'rt' (open for reading text). For binary random

     access, the mode 'w+b' opens and truncates the file to 0 bytes, while

     'r+b' opens the file without truncation. The 'x' mode implies 'w' and

     raises an `FileExistsError` if the file already exists.

     Python distinguishes between files opened in binary and text modes,

     even when the underlying operating system doesn't. Files opened in

     binary mode (appending 'b' to the mode argument) return contents as

     bytes objects without any decoding. In text mode (the default, or when

     't' is appended to the mode argument), the contents of the file are

     returned as strings, the bytes having been first decoded using a

     platform-dependent encoding or using the specified encoding if given.

     'U' mode is deprecated and will raise an exception in future versions

     of Python.  It has no effect in Python 3.  Use newline to control

     universal newlines mode.

     buffering is an optional integer used to set the buffering policy.

     Pass 0 to switch buffering off (only allowed in binary mode), 1 to select

     line buffering (only usable in text mode), and an integer > 1 to indicate

     the size of a fixed-size chunk buffer.  When no buffering argument is

     given, the default buffering policy works as follows:

     * Binary files are buffered in fixed-size chunks; the size of the buffer

       is chosen using a heuristic trying to determine the underlying device's

       "block size" and falling back on `io.DEFAULT_BUFFER_SIZE`.

       On many systems, the buffer will typically be 4096 or 8192 bytes long.

     * "Interactive" text files (files for which isatty() returns True)

       use line buffering.  Other text files use the policy described above

       for binary files.

     encoding is the name of the encoding used to decode or encode the

     file. This should only be used in text mode. The default encoding is

     platform dependent, but any encoding supported by Python can be

     passed.  See the codecs module for the list of supported encodings.

     errors is an optional string that specifies how encoding errors are to

     be handled---this argument should not be used in binary mode. Pass

     'strict' to raise a ValueError exception if there is an encoding error

     (the default of None has the same effect), or pass 'ignore' to ignore

     errors. (Note that ignoring encoding errors can lead to data loss.)

     See the documentation for codecs.register or run 'help(codecs.Codec)'

     for a list of the permitted encoding error strings.

     newline controls how universal newlines works (it only applies to text

     mode). It can be None, '', '\n', '\r', and '\r\n'.  It works as

     follows:

     * On input, if newline is None, universal newlines mode is

       enabled. Lines in the input can end in '\n', '\r', or '\r\n', and

       these are translated into '\n' before being returned to the

       caller. If it is '', universal newline mode is enabled, but line

       endings are returned to the caller untranslated. If it has any of

       the other legal values, input lines are only terminated by the given

       string, and the line ending is returned to the caller untranslated.

     * On output, if newline is None, any '\n' characters written are

       translated to the system default line separator, os.linesep. If

       newline is '' or '\n', no translation takes place. If newline is any

       of the other legal values, any '\n' characters written are translated

       to the given string.

     If closefd is False, the underlying file descriptor will be kept open

     when the file is closed. This does not work when a file name is given

     and must be True in that case.

     A custom opener can be used by passing a callable as *opener*. The

     underlying file descriptor for the file object is then obtained by

     calling *opener* with (*file*, *flags*). *opener* must return an open

     file descriptor (passing os.open as *opener* results in functionality

     similar to passing None).

     open() returns a file object whose type depends on the mode, and

     through which the standard file operations such as reading and writing

     are performed. When open() is used to open a file in a text mode ('w',

     'r', 'wt', 'rt', etc.), it returns a TextIOWrapper. When used to open

     a file in a binary mode, the returned class varies: in read binary

     mode, it returns a BufferedReader; in write binary and append binary

     modes, it returns a BufferedWriter, and in read/write mode, it returns

     a BufferedRandom.

     It is also possible to use a string or bytearray as a file for both

     reading and writing. For strings StringIO can be used like a file

     opened in a text mode, and for bytes a BytesIO can be used like a file

     opened in a binary mode.

 import os

 os.getcwd()

 os.chdir('/home/user/project/python_model/HeadFirstPython/chapter3')

 man = []

 other = []

 try:

  data = open('sketch.txt')

  for each_line in data:

   try:

    (role,line_spoken) = each_line.split(':',1)

    line_spoken = line_spoken.strip()

    if role == 'Man':

     man.append(line_spoken)

    elif role == 'Other Man':

     other.append(line_spoken)

   except ValueError:

    pass

  data.close()

 except IOError:

  print('The datafile is missing!')

 try:

  man_file = open('man_data.txt','w') # open a new file man_data.txt in-mode 'w'

  other_file = open('other_data.txt','w')# if the file don't exist then creat it.

  print(man,file=man_file)# write man data into man_file.txt

  print(other,file=other_file)# write other data into other_file.txt

  man_file.close()# close man_file

  other_file.close()# close other_file

 except IOError:

  print('File error')

>>> print(man)

['Is this the right room for an argument?', "No you haven't!", 'When?', "No you didn't!", "You didn't!", 'You did not!', 'Ah! (taking out his wallet and paying) Just the five minutes.', 'You most certainly did not!', "Oh no you didn't!", "Oh no you didn't!", "Oh look, this isn't an argument!", "No it isn't!", "It's just contradiction!", 'It IS!', 'You just contradicted me!', 'You DID!', 'You did just then!', '(exasperated) Oh, this is futile!!', 'Yes it is!']

>>> try:

    man_file=open('man_data.txt','w')

    other_file=open('other_data.txt','w')

    print(man,file=man_file)

    print(other,file=other_file)

    man_file.close()

    other_file.close()

except IOError:

    print('File error')

>>> import pickle

>>> try:

    with open('man_data1.txt','wb')as man_file:

        pickle.dump(man,man_file)

except IOError as err:

    print('File error:'+str(err))

except pickle.PickleError as perr:

    print('Pickling error:'+str(perr))

>>> new_man=[]

>>> try:

    with open('man_data1.txt','rb')as man_file:

        new_man = pickle.load(man_file)

except IOError as err:

    print('File error:'+str(err))

except pickle.PickleError as perr:

    print('Pickling error:'+str(perr))

>>> import nester01

>>> nester01.print_lol(new_man)

Is this the right room for an argument?

No you haven't!

When?

No you didn't!

You didn't!

You did not!

Ah! (taking out his wallet and paying) Just the five minutes.

You most certainly did not!

Oh no you didn't!

Oh no you didn't!

Oh look, this isn't an argument!

No it isn't!

It's just contradiction!

It IS!

You just contradicted me!

You DID!

You did just then!

(exasperated) Oh, this is futile!!

Yes it is!