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Sep 18th, 2009

Help a Novice with function please

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Hi All
Could you please help me with the following,
[code]
#Convert C to F
def Tc_to_Tf ():
Tc = input ("What is the Celsius Temperature ? " )
Tf = 9.0/5.0 * Tc + 32
print 'The temperature is ', Tf, ' Degrees Fahrenheit'
[code]

I get NameError: name 'Tf' is not defined
I dont understand as Tf is defined as a formulae?
Thanks in anticipation
Graham
Ps, dont think I have these tags right, some help here too please

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chico2009

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Sep 18th, 2009

Re: Help a Novice with function please

This works on my machine

(Toggle Plain Text)

#! /usr/bin/python

#Convert C to F
def Tc_to_Tf():
	Tc = input ("What is the Celsius Temperature ? " )
	Tf = 9.0/5.0 * Tc + 32
	print 'The temperature is ', Tf, ' Degrees Fahrenheit'

Tc_to_Tf()

gerard4143

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Postaholic

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Sep 18th, 2009

Re: Help a Novice with function please

Like gerard4143 says, you have to make the print statement part of the function, since Tf is local to the function. The other option would be to return Tf to make it available outside the function:

python Syntax (Toggle Plain Text)
#Convert C to F
def Tc_to_Tf ():
    Tc = input ("What is the Celsius Temperature ?   " )
    Tf = 9.0/5.0 * Tc + 32
    return Tf
 
Tf = Tc_to_Tf ()
print 'The temperature is ', Tf, ' Degrees Fahrenheit'
#Convert C to F
def Tc_to_Tf ():
    Tc = input ("What is the Celsius Temperature ?   " )
    Tf = 9.0/5.0 * Tc + 32
    return Tf

Tf = Tc_to_Tf ()
print 'The temperature is ', Tf, ' Degrees Fahrenheit'

Please use the [code=python] and [/code] tag pair to enclose your python code.

sneekula

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Nearly a Posting Maven

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Sep 19th, 2009

Re: Help a Novice with function please

Alternatively you can use placeholder (same Snee's example)

python Syntax (Toggle Plain Text)
 
#Convert C to F
def Tc_to_Tf ():
    Tc = input ("What is the Celsius Temperature ?   " )
    Tf = 9.0/5.0 * Tc + 32
    return Tf
 
Tf = Tc_to_Tf ()
#.2f instructs Python that placeholder holds float number with 2decimal places. try 3f, 4f etc and see how it does
print 'The temperature is %.2f Degrees Fahrenheit' %(Tf, )
 
#Convert C to F
def Tc_to_Tf ():
    Tc = input ("What is the Celsius Temperature ?   " )
    Tf = 9.0/5.0 * Tc + 32
    return Tf

Tf = Tc_to_Tf ()
#.2f instructs Python that placeholder holds float number with 2decimal places. try 3f, 4f etc and see how it does
print 'The temperature is %.2f Degrees Fahrenheit' %(Tf, )

evstevemd

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Sep 19th, 2009

Re: Help a Novice with function please

Hi Guys
Thanks very much for your post.
I understand now that I have to make Tf part of the function and how to do so.
I dont understand your Tf=Tc_toTf () command, could you please explain how it works.

Many thanks
Graham

chico2009

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Sep 19th, 2009

Re: Help a Novice with function please

Click to Expand / Collapse Quote originally posted by chico2009 ...

Hi Guys
Thanks very much for your post.
I understand now that I have to make Tf part of the function and how to do so.
I dont understand your Tf=Tc_toTf () command, could you please explain how it works.

Many thanks
Graham

It simply means that function Tc_toTf() returns a value that you want to put into variable TF.

vegaseat

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DaniWeb's Hypocrite

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Sep 19th, 2009

Re: Help a Novice with function please

python Syntax (Toggle Plain Text)
def Tc_to_Tf ():
    Tc = input ("What is the Celsius Temperature ?   " )
    Tf = 9.0/5.0 * Tc + 32
    return Tf
def Tc_to_Tf ():
    Tc = input ("What is the Celsius Temperature ?   " )
    Tf = 9.0/5.0 * Tc + 32
    return Tf

Run it an nothing happends it only return Tf
Let do something simple in idle.

python Syntax (Toggle Plain Text)
IDLE 2.6.2      
>>> Tf = 50
>>> print 'The temperature is %.2f Degrees Fahrenheit' % (Tf)
The temperature is 50.00 Degrees Fahrenheit
>>>
IDLE 2.6.2      
>>> Tf = 50
>>> print 'The temperature is %.2f Degrees Fahrenheit' % (Tf)
The temperature is 50.00 Degrees Fahrenheit
>>>

So the only diffrence is that we put function call i a variable.
Tf = Tc_to_Tf ()

snippsat

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Sep 20th, 2009

Re: Help a Novice with function please

Hi Folks
Thanks all for your help

chico2009

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