testStrings.py

#testStrings.py
#Author: David Strube
#Date: 2015-12-30
#What is: testing python string stuffs

#function doing string stuffs: indexing
def stringF0():
	print()
	string = "string"
	print("string = " + string)
	print("string[0] = " + string[0]) #s
	print("string[-1] = " + string[-1]) #g
	print("string[-2] = " + string[-2]) #n
	print("string[-6] = " + string[-6]) #s
	#print("string[-7] = " + string[-7]) #index out of range error
	print("string[1:1] = " + string[1:1]) #nothing
	print("string[1:4] = " + string[1:4]) #tri
	print("string[1:] = " + string[1:]) #tring
	print("string[4:] = " + string[:4]) #stri
	return
#stringF0()

#function doing string stuffs: comparison, conversion, and find
def stringF1(s):
	print("testing : '" + s +"'")
	print("s == s[:] = " + str(s == s[:]))					#True
	print("s == s + s[0:-1+1] = " + str(s == s + s[0:-1+1])) #True
	print("s == s[0:] = " + str(s == s[0:]))					#True
	print("s == s[:-1] ('" + s[:-1] + "')= " + str(s == s[:-1]))				#False
	print("s == s[:3] + s[3:] = " + str(s == s[:3] + s[3:])) #True
	print("s.find(s) = " + str(s.find(s)))					#0
	print("'s'.find('s') = " + str('s'.find('s')))			#0
	print("s.find('') = " + str(s.find('')))					#0
	print("s.find(s+'!!!')+1 = " + str(s.find(s+'!!!') + 1)) #0
	#there is also .find(string x,int pos)
	print()
	return
#stringF1("hey")
#stringF1("")
#stringF1("1234")
	
#function doing string stuffs, pt 2
def stringF2(s, t, i):
	print("testing : s = '" + s + "', t = '" + t + "', i = '" + str(i) + "'")
	#which of these is equivalent to s.find(t,i):
	#s[i:].find(t)										#yes? no

	#the slash at the end of this next line does line continuation, but must be the last character on the line; even a space (' ') will mess it up
	print("s.find(t,i) (" +str(s.find(t,i))+ ") == s[i:].find(t) (" \
+ str(s[i:].find(t))+ ") = " + str(s.find(t,i) == s[i:].find(t)))		
		#also, there must be no comment between first half and second half of line continuation.
		#indentation doesn't matter on line continuation
				
	#s.find(t)[:i] 		#no
	#s[i:].find(t) + i	#no
	#s[i:].find(t[i:])									#no? no
	print("s.find(t,i) (" +str(s.find(t,i))+ ") == s[i:].find(t[i:]) (" +str(s[i:].find(t[i:]))+ ") = " + str(s.find(t,i) == s[i:].find(t[i:])))		
	print()
	return
#stringF2("hey","h",0)
#stringF2("","",0)
#stringF2("1234","4",2)

def stringF3():
	atag = '<a href="'
	print("atag = " + atag + ", length = " + str(len(atag)))
	#Given string page with html text, what is the location of the first <a> tag?
	#start_link = page.find(atag)

	#What is the url in the first <a> tag?
	end_atag='"'
	#end_link = page.find(end_atag, start_link + len(atag))
	#url = page[start_link + len(atag) : end_link]
	return
#stringF3()

def stringF4():
	#from https://www.scheller.gatech.edu/feeds/directory.xml
	inFileName = "2_dir.xml" #"schellerDirectory.xml"
	inFileMode = "rt"
	outFileName = "2_dirOut.xml" #"schellerDirectoryOut.xml"
	outFileMode = "at"
	with open(inFileName, inFileMode) as fileIn:
		countIn = 0
		badChars = ""
		for lineIn in fileIn:
			#print(lineIn, end='')
			for charIn in lineIn:
				if charIn != '{' and charIn != '}' and not charIn.isalpha() and \
				not charIn.isdigit() and charIn != '"' and charIn != ':' and \
				not charIn.isspace() and charIn != '#' and charIn != '\\' and \
				charIn != ',' and charIn != '.'  and charIn != '[' and charIn != ']' and \
				charIn != '-' and charIn != '@' and charIn != '/' and charIn != '_' \
				and charIn != '(' and charIn != ')' and charIn != '\'' and charIn != '=' \
				and charIn != '~' and charIn != '&' and charIn != '!' and charIn != '$' \
				and charIn != '+' and charIn != '%' and charIn != '?' and charIn != ';' \
				and charIn != '|' and charIn != '<' and charIn != '>' and charIn not in badChars:
					#print(charIn, end='')
					badChars += charIn
			#countIn += 1
			#if countIn > 1000:
			#	break
			with open(outFileName, outFileMode) as fileOut:
				for badChar in badChars:
					if badChar in lineIn:
						lineIn = lineIn.replace(badChar, "")
				fileOut.write(lineIn)
	print()
	#print("length of badChars: " + str(len(badChars)))
	#print("badChars: " + badChars)
stringF4()