And that's the problem. Your toy Python interpreter did not catch the problem.
I know it's meant to make it easy for student to share the link for their homework but the python implementation lack some feature. 
Topic: Programming in Python - page 2. (Read 2734 times)
The problem is not with the functions. This is pointless:
Code:
def miles_to_km_with_float(miles):
return float(miles) * 1.60934
Everything I said is correct.
You're writing bad code. Here is a fixed version of your code:
You're writing bad code. Here is a fixed version of your code:
Code:
def miles_to_km_no_float(miles):
return miles * 1.60934
def miles_to_km_with_float(miles):
return float(miles) * 1.60934
miles_input=input('Please input miles to convert in km:')
print str(miles_input) + " miles = " + str(miles_to_km_no_float(miles_input)) + " km (no float)"
print str(miles_input) + " miles = " + str(miles_to_km_with_float(miles_input)) + " km (float)"
It works fine using python on my computer but still get the same old result with codeskulptor.
And that's the problem. Your toy Python interpreter did not catch the problem.
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
print miles_input + " miles = " + str(miles_to_km_no_float(miles_input)) + " km (no float)"
TypeError: unsupported operand type(s) for +: 'int' and 'str'
Everything I said is correct.
You're writing bad code. Here is a fixed version of your code:
You're writing bad code. Here is a fixed version of your code:
Code:
def miles_to_km_no_float(miles):
return miles * 1.60934
def miles_to_km_with_float(miles):
return float(miles) * 1.60934
miles_input=input('Please input miles to convert in km:')
print str(miles_input) + " miles = " + str(miles_to_km_no_float(miles_input)) + " km (no float)"
print str(miles_input) + " miles = " + str(miles_to_km_with_float(miles_input)) + " km (float)"
I'm pretty sure I know what your problem is. First, what version of Python are you using. Type python at the command prompt.
An integer multiplied by a float returns a float. Since 1.60934 is a float, even if miles is an integer, the result will be a float.
If miles == 1 with this code:
Code:
def miles_to_km(miles):
return miles * 1.60934
The answer is "11"
If use this line:
Code:
def miles_to_km(miles):
return float(miles) * 1.60934
The answer is correct.
This program prints 1.60934.
Code:
def miles_to_km(miles):
return miles * 1.60934
print miles_to_km(1)
Show me your entire program here.
http://www.codeskulptor.org/#user19_9Zu5nZ2ctm_3.py
I think it's because that I convert a string to a float. It is not integer --> float.
An integer multiplied by a float returns a float. Since 1.60934 is a float, even if miles is an integer, the result will be a float.
If miles == 1 with this code:
Code:
def miles_to_km(miles):
return miles * 1.60934
The answer is "11"
If use this line:
Code:
def miles_to_km(miles):
return float(miles) * 1.60934
The answer is correct.
This program prints 1.60934.
Code:
def miles_to_km(miles):
return miles * 1.60934
print miles_to_km(1)
Show me your entire program here.
An integer multiplied by a float returns a float. Since 1.60934 is a float, even if miles is an integer, the result will be a float.
If miles == 1 with this code:
Code:
def miles_to_km(miles):
return miles * 1.60934
It prints "11"
If use this line:
Code:
def miles_to_km(miles):
return float(miles) * 1.60934
The answer is correct.
An integer multiplied by a float returns a float. Since 1.60934 is a float, even if miles is an integer, the result will be a float.
Nice 
Edit:
Improved version that assumes that the user only input numbers:
Code:
def miles_to_km(miles):
return miles * 1.60934
def km_to_miles(km):
return km / 1.60934
print miles_to_km(10)
print km_to_miles(16.0934)
Edit:
Improved version that assumes that the user only input numbers:
Code:
def miles_to_km(miles):
return float(miles) * 1.60934
def km_to_miles(km):
return float(km) / 1.60934
miles_input = input('Please input miles to convert in km:')
print miles_input + " miles = " + str(miles_to_km(miles_input)) + " km"
km_input = input('Please input km to convert in miles:')
print km_input + " km = " + str(km_to_miles(km_input)) + " miles"
Working on the functions lesson at the moment, I didn't really understand it at first. I think I've got it now as I tried to write some of my own and it outputs the correct answer. Maybe someone can check that my thinking is right on these functions I wrote.
Quote
# converts cm to inches
def cm_to_inches(cm):
inch = 1 / 2.54 * cm
return inch
a1 = cm_to_inches(25.4)
print a1
def cm_to_inches(cm):
inch = 1 / 2.54 * cm
return inch
a1 = cm_to_inches(25.4)
print a1
Less lines are better when it doesn't reduce clarity. The reason is it allows more lines visible on the screen, which allows greater comprehension while examining the code. But don't sacrifice white space to achieve that.
Quote
def cm_to_inches(cm):
return cm / 2.54
return cm / 2.54
And there's no point in dividing by 1 or multiplying by 1 or zero when they are constants:
Quote
# convert inches to cm
def inch_to_cm(inch):
cm = 2.54 / 1 * inch
return cm
def inch_to_cm(inch):
cm = 2.54 / 1 * inch
return cm
Try this:
Quote
def inch_to_cm(inch):
return inch * 2.54
return inch * 2.54
I recommend trying a guide called learn python the hard way.
It is really helpful and easy.
It is really helpful and easy.
Is this about right for creating a function and then creating another which calls the previous function?
http://www.codeskulptor.org/#user19_v3vzRwYgMq_1.py
You can call a function anywhere you want in your code, even inside another function. http://www.codeskulptor.org/#user19_v3vzRwYgMq_1.py
Is this about right for creating a function and then creating another which calls the previous function?
http://www.codeskulptor.org/#user19_v3vzRwYgMq_1.py
http://www.codeskulptor.org/#user19_v3vzRwYgMq_1.py
Yep you got it
Just two remarks: do you know you can "print cm_to_inches(1.0)" directly? And why writing ones in the formulas? Why not just "cm=2.54*inch"?
Just two remarks: do you know you can "print cm_to_inches(1.0)" directly? And why writing ones in the formulas? Why not just "cm=2.54*inch"?
The example used in the course is fahrenheit to celsius but I couldn't seem to grasp it. I tried thinking of a few different ways I might use a function and those are just the things that came to mind. Obviously they are not useful as you've provided better options but for the purposes of understanding how a function operates, it seems to have worked for me
By the way there is a computer networks course starting in 3 months: https://www.coursera.org/course/comnetworks
Quote
Course Syllabus:
Introduction, Protocols and Layering
Physical and Link layers
Retransmissions, Multiple access, Switching
Network layer, Internetworking
Intra- and Inter-domain Routing
Transport layer, Reliability
Congestion Control
DNS, Web/HTTP, Content Distribution
Quality of Service and Real-time Apps
Network Security
Introduction, Protocols and Layering
Physical and Link layers
Retransmissions, Multiple access, Switching
Network layer, Internetworking
Intra- and Inter-domain Routing
Transport layer, Reliability
Congestion Control
DNS, Web/HTTP, Content Distribution
Quality of Service and Real-time Apps
Network Security
do you know you can "print cm_to_inches(1.0)" directly?
You are right but he did it the way it is taught in the video. I guess it is easier for beginner to understand.
You can share your code with CodeSkulpor for easier review: http://www.codeskulptor.org/#user19_HWWqVRQDa8_0.py
I don't know the exact formula but the code looks good to me.
I just finished everything for this week.
I don't know the exact formula but the code looks good to me.
I just finished everything for this week.
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