Semi-colons end lines in Python.
Ohhh, you mean semicolons in general. I was looking for a string of four semicolons. 
Python doesn't require them, but I'm a C programmer, so I put them by force of habit. Souvik, Python relies on whitespace to mark line endings, so semicolons are not necessary.
Python doesn't require them, but I'm a C programmer, so I put them by force of habit. Souvik, Python relies on whitespace to mark line endings, so semicolons are not necessary. 
ScoutDavid wrote:
I never used them and never saw them being used so I acted strange 
Now that we got passed that (protip: try Googling "python semicolons"), did you try using my routine. KermMartian wrote:
ScoutDavid wrote:
I never used them and never saw them being used so I acted strange
Now that we got passed that (protip: try Googling "python semicolons"), did you try using my routine.Code:
def mybytearray(thisblist): #this stunningly awkward hack is for 2.x/3.x compat
if sys.version[0] == '2':
mystr = ""
for i in range(0,len(thisblist)):
mystr += chr(int(thisblist[i]));
return mybytes(mystr,encoding="ascii");
else:
return bytearray(thisblist); I don't need it anymore for creating files, I got over it.
My current problem is converting hex code to strings.
Like 68656c6c6f to hello.
Couple things I see here.
Code:
If you have Python 2.7, you get bytearrays for free, no hacks required. If you want to support older versions yet, I think it would be cleaner to do something like this in your module's globals:
Code:
For converting integers to a string (assuming you have a string of numbers maybe), I'd iterate and concatenate using chr. Something like the following:
Code:
(wftspacing? I formatted it fine)
Code:
def mybytearray(thisblist): #this stunningly awkward hack is for 2.x/3.x compat
if sys.version[0] == '2':
mystr = ""
for i in range(0,len(thisblist)):
mystr += chr(int(thisblist[i]));
return mybytes(mystr,encoding="ascii");
else:
return bytearray(thisblist); If you have Python 2.7, you get bytearrays for free, no hacks required. If you want to support older versions yet, I think it would be cleaner to do something like this in your module's globals:
Code:
try:
bytearray()
except NameError:
class bytearray(object):
"""Implements the bytearray features you need"""
passFor converting integers to a string (assuming you have a string of numbers maybe), I'd iterate and concatenate using chr. Something like the following:
Code:
(i, s) = (0, '68656c6c6f')
s_out = ''
while i < len(s):
s_out += chr(s[i:i+2])
i += 2(wftspacing? I formatted it fine)
Tari wrote:
Er, yeah. Make that chr(int(s[i:i+2],16)).
Much better, I agree with that. Scout, does that all make sense to you?
I got it, but I don't need to create bytearrays now, I've done that part in Assemblex. My problem is just counting bytes.
@KermM: It's a string like:
Code:
@KermM: It's a string like:
Code:
str1 = "464782"
So is Tari's solution not needed? It looks like you're just asking for len(str1)/2 to me, or perhaps:
Code:
Code:
if 2*math.floor(len(str1)/2) != 0:
print "ERROR: string not multiple of two nibbles!"
sys.exit(-1)
bytecount = len(str1)/2
Why not:
Code:
Code:
if len(str1)%2 == 1:
print "ERROR: string not multiple of two nibbles!"
sys.exit(-1)
bytecount = len(str1)/2
Yeah, that's would be the better way to do it, thanks, Shaun. I've gotten too used to languages like TI-BASIC that have no modulus operator.
I've gotten too used to languages like TI-BASIC that have no modulus operator.
I have a Python question: how to sum bytes.
For the checksum I need the sum of all the bytes in the data section (which includes the assembly code and the variable header, right?).
This is my old code:
Code:
This is not working though, the value returned is not the correct code(I think).
Any idea if this actually is correct or it doesn't work for some reason I can't see?
For the checksum I need the sum of all the bytes in the data section (which includes the assembly code and the variable header, right?).
This is my old code:
Code:
hexArray = [dataSection[x:x+2] for x in xrange(0,len(dataSection),2)] #Split dataSection in groups of 2 chars (bytes)
sumo=0
for i in range(0,len(hexArray)): #Loop through hex array
sumo += int(str(hexArray[i]),16) #Add the integer value
checksum = str(sumo[2]+sumo[3]+sumo[0]+sumo[1]) #Little Endian
This is not working though, the value returned is not the correct code(I think).
Any idea if this actually is correct or it doesn't work for some reason I can't see?
Code:
hexArray = [dataSection[x:x+2] for x in xrange(0,len(dataSection),2)] #Split dataSection in groups of 2 chars (bytes)
sumo=0
for i in range(0,len(hexArray)): #Loop through hex array
sumo += int(str(hexArray[i]),16) #Add the integer value
checksum = str(sumo)[2]+str(sumo)[3]+str(sumo)[0]+str(sumo)[1] #Little Endian merthsoft wrote:
And does that work?
Question seconded. Are you posting the code because it doesn't work and you don't understand why not, or because you want us to check if it will work or not?
If this is the code of a certain program:
2A2A54493833462A
1A0A0046696C6520
67656E6572617465
6420627920576162
6269745369676E00
0000000000000000
000000000022000D
001100064D594649
4C45000000001100
0F00BB6DEF404521
0500EF0745EF7249
C97A08
Is this the data section?:
0D
001100064D594649
4C45000000001100
0F00BB6DEF404521
0500EF0745EF7249
C9
I need to know that so I can know if I'm using the right values in my getCheckSum( function.
Code:
2A2A54493833462A
1A0A0046696C6520
67656E6572617465
6420627920576162
6269745369676E00
0000000000000000
000000000022000D
001100064D594649
4C45000000001100
0F00BB6DEF404521
0500EF0745EF7249
C97A08
Is this the data section?:
0D
001100064D594649
4C45000000001100
0F00BB6DEF404521
0500EF0745EF7249
C9
I need to know that so I can know if I'm using the right values in my getCheckSum( function.
Code:
def getCheckSum(dataSection):
hexArray = [dataSection[x:x+2] for x in xrange(0,len(dataSection),2)]
sumo=0
for i in range(0,len(hexArray)):
sumo += int(str(hexArray[i]),16)
checksum = str(sumo)[2]+str(sumo)[3]+str(sumo)[0]+str(sumo)[1]
return checksumRegister to Join the Conversation
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