Cannot concatenate 'str' and 'float' objects?
Solution 1
All floats or non string data types must be casted to strings before concatenation
This should work correctly: (notice the str
cast for multiplication result)
easygui.msgbox=("You need "+ str(3.14*(float(radius)**2) * float(height)) + "gallons of water to fill this pool.")
straight from the interpreter:
>>> radius = 10
>>> height = 10
>>> msg = ("You need "+ str(3.14*(float(radius)**2) * float(height)) + "gallons of water to fill this pool.")
>>> print msg
You need 3140.0gallons of water to fill this pool.
Solution 2
There is one more solution, You can use string formatting (similar to c language I guess)
This way you can control the precision as well.
radius = 24
height = 15
msg = "You need %f gallons of water to fill this pool." % (3.14 * (float(radius) ** 2) * float(height))
print(msg)
msg = "You need %8.2f gallons of water to fill this pool." % (3.14 * (float(radius) ** 2) * float(height))
print(msg)
without precision
You need 27129.600000 gallons of water to fill this pool.
With precision 8.2
You need 27129.60 gallons of water to fill this pool.
Solution 3
With Python3.6+, you can use f-strings to format print statements.
radius=24.0
height=15.0
print(f"You need {3.14*height*radius**2:8.2f} gallons of water to fill this pool.")
user2443381
Updated on October 03, 2020Comments
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user2443381 over 3 years
Our geometry teacher gave us an assignment asking us to create an example of when toy use geometry in real life, so I thought it would be cool to make a program that calculates how many gallons of water will be needed to fill a pool of a certain shape, and with certain dimensions.
Here is the program so far:
import easygui easygui.msgbox("This program will help determine how many gallons will be needed to fill up a pool based off of the dimensions given.") pool=easygui.buttonbox("What is the shape of the pool?", choices=['square/rectangle','circle']) if pool=='circle': height=easygui.enterbox("How deep is the pool?") radius=easygui.enterbox("What is the distance between the edge of the pool and the center of the pool (radius)?") easygui.msgbox=("You need "+(3.14*(float(radius)**2) * float(height)) + "gallons of water to fill this pool.")
i keep getting this error though:
easygui.msgbox=("You need "+(3.14*(float(radius)**2) * float(height)) + "gallons of water to fill this pool.") TypeError: cannot concatenate 'str' and 'float' objects
what do i do?
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Toskan over 5 yearsthis is the only solution, really? you have to put it into a
str()
function? a bit depressing