I suck at coding need some help

Okay, so I have to make a code in python that converts from decimal to binary decimal to hexadecimal and lastly from binary to decimal. This is what I have so far:

Decimal to binary

 Spoiler

# convert a decimal to binary

def Denary2Binary(n):
'''convert denary integer n to binary string bStr'''
bStr = ''
if n < 0: raise ValueError, "must be a positive integer"
if n == 0: return '0'
while n > 0:
bStr = str(n % 2) + bStr
n = n >> 1
return bStr
def int2bin(n, count=24):
"""returns the binary of integer n, using count number of digits"""
return "".join([str((n >> y) & 1) for y in range(count-1, -1, -1)])

if __name__ == '__main__':
print Denary2Binary(255)
print int(Denary2Binary(255), 2)
print

print int2bin(255, 12)

print int("000011111111", 2)
print

print Denary2Binary(0)
print Denary2Binary(-5)

decimal to hexadecimal

 Spoiler

#converting decimal to hexdecimal
def decToHex():
#Get number from user
number=int(input("enter a postive number ")
if(number is<= 0)
0)
print("enter a postive number")
if(number=0)
print("the hexadecimal value of 0 equals 0")
else
hstr=" "
q=number
while(q>0):
if(q%16<10):
hstr=str(q%16)+hstr
elif(q%16==10):
hstr="A"+hstr
elif(q%16==11):
hstr="B"+hstr
elif(q%16==12):
hstr="C"+hstr
elif(q%16==13):
hstr="D"+hstr
elif(q%16==14):
hstr="E"+hstr
elif(q%16==15):
else:
hstr="F"+hstr
q=q//16
print(number, "converted to hexadecimal is " , hstr)

Binary to decimal

 Spoiler

def decimal_to_binary(arr,decimal):
if decimal ==1:
arr.append(1)
else:
rem = decimal%2
arr.append(rem)
rev = decimal/2
decimal_to_binary(arr,rev)
string
for i in arr[::-1]:
string+=str(i)
return string

I try to run these and I keep getting syntax errors so the program won't run and I have no idea how to fix them. So could anyone help me correct them not necessarily do them for me but at least give me a better explanation of where the errors are and what to do to fix them any help at all would be appreciated I'm at my wits end here.

Good news is decimal to binary and binary to decimal seem to work fine. The only one that seems to have a problem is decimal to hexadecimal.

Code:

def decToHex():
    #Get number from user
    number=int(input("enter a postive number ")#Missing a parenthesis
    if(number is<= 0) #What's that is doing there? Also, need a colon
        0)#What's this?
        print("enter a postive number")
        if(number=0) #Should not be an assignment, also a colon
            print("the hexadecimal value of 0 equals 0")
    else #Colon needed here
        hstr=" "
        q=number
        while(q>0):
            if(q%16<10):
                hstr=str(q%16)+hstr
            elif(q%16==10):
                hstr="A"+hstr
            elif(q%16==11):
                hstr="B"+hstr
            elif(q%16==12):
                hstr="C"+hstr
            elif(q%16==13):
                hstr="D"+hstr
            elif(q%16==14):
                hstr="E"+hstr
            elif(q%16==15):
            else: #This else probably shouldn't be here
                hstr="F"+hstr
            q=q//16
    print(number, "converted to hexadecimal is " , hstr)

If you make the changes where I added comments it should compile.

I would also highly recommending downloading a good python IDE - I currently use PyCharm and it works pretty well.