#----------------------------------------------------------------------
# Illustration of the use of global variables, in the context of
# writing out HTML Web files.
#
# Copyright (C) November 8, 2017 -- Dr. William T. Verts
#
# File handle MyFile is global to both Write and Main, so a change in
# either one is seen by the other. This simplifies the writing of
# text to a file, as the file handle (and line break) can now never
# be forgotten. However, this is a "back-channel" way to
# communicate information between functions that doesn't use the
# normal mechanisms of the parameter list or the return statement.
# Global variables are to be used cautiously, as detrimental side
# effects can occur if programmers are careless.
#----------------------------------------------------------------------
def Write (S):
global MyFile
MyFile.write(S + "\n")
return
def Main():
global MyFile
Filename = pickAFolder() + "Test.html"
print Filename
#----------------------------------------
# Multiline string, for the top of an
# HTML Web file.
#----------------------------------------
Prologue = """
My Spiffy Web Page
"""
#----------------------------------------
# Multiline string, for the bottom of an
# HTML Web file.
#----------------------------------------
Epilogue = """
"""
#----------------------------------------
# Build the Web page by writing out the
# prologue, a table of numbers and square
# roots from 0 to 1000, and the epilogue.
#----------------------------------------
MyFile = open(Filename, "w")
Write (Prologue)
Write ("