Programming in Python

[FirstAscent]

So, unless you want to draw erroneous conclusions about how to program, as has become glaringly obvious in this little episode, I suggest you only test your code using your local python interpreter.

[01BTC10]

So, unless you want to draw erroneous conclusions about how to program, as has become glaringly obvious in this little episode, I suggest you only test your code using your local python interpreter.

I will; however, the online interpreter is the only way to submit our work for the course.   

[FirstAscent]

So, unless you want to draw erroneous conclusions about how to program, as has become glaringly obvious in this little episode, I suggest you only test your code using your local python interpreter.

I will; however, the online interpreter is the only way to submit our work for the course.   

Even so, the function was not the problem. Run this online:

Code:

def miles_to_km(miles):
    return miles * 1.60934

print miles_to_km(1) 

[FirstAscent]

Even further proof: here we're guaranteeing that we're passing an integer into the function:

Code:

def miles_to_km(miles):
    return miles * 1.60934

print miles_to_km(int(1)) 

[01BTC10]

Even further proof: here we're guaranteeing that we're passing an integer into the function:

Code:

def miles_to_km(miles):
    return miles * 1.60934

print miles_to_km(int(1)) 

Yes, I know this is how I did it the first time but it doesn't works using input() in the online version.

[FirstAscent]

Code:

def miles_to_km(miles):
    return miles * 1.60934

miles_input = input('Please input miles to convert in km: ')
print miles_to_km(float(miles_input)) 

What's likely happening here is that when querying for input, you're getting a string. What you want is a number. You don't know if the string, when converted to a number, has a decimal place or not, so you take the safe route and convert it to a float. But this is all about preparing the arguments for the function.

The function should expect a number (int or float) and receive that.

[Peter Lambert]

I'm pretty sure I know what your problem is. First, what version of Python are you using. Type python at the command prompt.

There is no command prompt. It's a web browser implementation for the course. It works fine with codeskulptor but throw an error with python 2.7.3 on my computer.

Code:

Traceback (most recent call last):
  File "test.py", line 13, in <module>
    print miles_input + " miles = " + str(miles_to_km_no_float(miles_input)) + " km (no float)"
TypeError: unsupported operand type(s) for +: 'int' and 'str'

for the print command, intead of adding a bunch of things together, it might be better to use placeholders?

Code:

print "%f miles = %f km." % (miles_input, miles_to_km_no_float(miles_input))

[FirstAscent]

I'm pretty sure I know what your problem is. First, what version of Python are you using. Type python at the command prompt.

There is no command prompt. It's a web browser implementation for the course. It works fine with codeskulptor but throw an error with python 2.7.3 on my computer.

Code:

Traceback (most recent call last):
  File "test.py", line 13, in <module>
    print miles_input + " miles = " + str(miles_to_km_no_float(miles_input)) + " km (no float)"
TypeError: unsupported operand type(s) for +: 'int' and 'str'

for the print command, intead of adding a bunch of things together, it might be better to use placeholders?

Code:

print "%f miles = %f km." % (miles_input, miles_to_km_no_float(miles_input))

Yes. Such power using C style printf printing. Read up on formatting for printf.

[01BTC10]

Nice one.

http://en.wikipedia.org/wiki/Printf_format_string#1990s:_PHP.2C_Python

[MakeBelieve]

I need to learn python

[gangplank]

I need to learn python

Jump aboard with this course! I'm pretty much a beginner so we can assist one another via this thread I'm dedicating 1-2 hours a day to this, just need to make it habit for it to stick in my mind otherwise I'll forget.

[gangplank]

So, unless you want to draw erroneous conclusions about how to program, as has become glaringly obvious in this little episode, I suggest you only test your code using your local python interpreter.

I don't know if this is related but it only uses the libraries we need to complete the course.

[MakeBelieve]

I need to learn python

Jump aboard with this course! I'm pretty much a beginner so we can assist one another via this thread I'm dedicating 1-2 hours a day to this, just need to make it habit for it to stick in my mind otherwise I'll forget.

Will do. Coursera seems to have other awesome courses too.

[Baitty]

There was a thread on this forum with different things people created with python.

[jackjack]

Traceback (most recent call last):
  File "test.py", line 13, in <module>
    print miles_input + " miles = " + str(miles_to_km_no_float(miles_input)) + " km (no float)"
TypeError: unsupported operand type(s) for +: 'int' and 'str'

int
str

Fix

print str(miles_input) + " miles = " + str(miles_to_km_no_float(miles_input)) + " km (no float)"

[MakeBelieve]

I've started the course once again.

[FirstAscent]

Traceback (most recent call last):
  File "test.py", line 13, in <module>
    print miles_input + " miles = " + str(miles_to_km_no_float(miles_input)) + " km (no float)"
TypeError: unsupported operand type(s) for +: 'int' and 'str'

int
str

Fix

print str(miles_input) + " miles = " + str(miles_to_km_no_float(miles_input)) + " km (no float)"

It's already been done.

[01BTC10]

I found another course but this one use a real interpreter : https://www.edx.org/course/mit/6-00-1x/introduction-computer-science/1122