Creating fibonacci sequence generator (Beginner Python)

Question

Hi I'm trying to create a Fibonacci sequence generator in Python. This is my code:

d =raw_input("How many numbers would you like to display")

a = 1
b = 1

print a
print b

for d in range(d):
    c = a + b 
    print c
    a = b
    b = c

When I ran this program, I get the error:

File "Fibonacci Sequence Gen.py", line 10, in <module>
    for d in range(d):
TypeError: range() integer end argument expected, got str

Thanks for your help, I'm trying to teach myself python with basic projects.

Answer 1

raw_input returns a string. So convert d to an integer with:

d = int(d)

One more thing: Do not use for d in range(d). It works but it is awful, unpythonic, whatever.
Try this way for example:

numbers = raw_input("How many numbers would you like to display")

a = 1
b = 1

print a
print b

for d in range(int(numbers)):
    c = a + b 
    print c
    a = b
    b = c

Edit: I complete below the answer with additional code tuning (thanks to commenters):

# one space will separate better visually question and entry in console
numbers = raw_input("How many numbers would you like to display > ")    

# I personnally prefer this here, although you could put it
# as above as `range(int(numbers))` or in `int(raw_input())`
# In a robust program you should use try/except to catch wrong entries
# Note the number you enter should be > 2: you print 0,1 by default
numbers = int(numbers)  

a, b = 0, 1        # tuple assignation
                   # note fibonnaci is 0,1,1,2,3...

print a            # you can write this as print "%i\n%i" % (a, b)
print b            # but I think several prints look better in this particular case.

for d in range(numbers - 2):  # you already printed 2 numbers, now print 2 less
    c = a + b 
    print c
    a, b = b, c    # value swapping.
                   # A sorter alternative for this three lines would be:
                   # `a, b = b, a + b`
                   # `print b`