我不在 print_output 函数中出现此错误的原因

Question

I don't under the reason for this error in the print_output function. This may be an issue with the other functions. I am not sure what the formatting error is.

'''

 def print_output(i):
   print (f"OUTPUT {i}")

 def triangle_hypotenuse(side_1, side_2):
   sqrt((side_1 ** 2) + (side_2 ** 2)) = h
   h = "{:.2f}".format(h)
   print_output(h)

 def feet_to_meters(feet):
   meters = feet/3.281
   meters = "{:.4f}".format(meters)
   print_output(meters)

 def polar_coords(x,y):
   radius = math.sqrt( x * x + y * y )
   theta = math.atan(y/x)
   theta = 180 * theta/math.pi
   r = "{:.2f}".format(radius)
   t = "{:.2f}".format(theta)
   phrase_1 = "r: " + r
   phrase_2 = "theta: " + t
   combined = phrase_1 + phrase_2
   print_output(combined)

 def dollars_to_euros(dollars):
   euros = dollars * 0.99
   euros = "{:.2f}".format(dollars)
   print_output(euros

Error : 
 >>> print_output("Hello World")
Traceback (most recent call last):
File "<pyshell#0>", line 1, in <module>
print_output("Hello World")
NameError: name 'print_output' is not defined

'''

Answer 1

Create a txt file and name it to "myfile.py". Make sure your file extension has been changed from .txt to .py. Then paste the following in that python file which you can open with either an IDE or notepad.

import math
def print_output(i):
   print (f"OUTPUT {i}")

def triangle_hypotenuse(side_1, side_2):
   h = math.sqrt((side_1 ** 2) + (side_2 ** 2))
   h = "{:.2f}".format(h)
   print_output(h)

def feet_to_meters(feet):
   meters = feet/3.281
   meters = "{:.4f}".format(meters)
   print_output(meters)

def polar_coords(x,y):
   radius = math.sqrt( x * x + y * y )
   theta = math.atan(y/x)
   theta = 180 * theta/math.pi
   r = "{:.2f}".format(radius)
   t = "{:.2f}".format(theta)
   phrase_1 = "r: " + r
   phrase_2 = "theta: " + t
   combined = phrase_1 + phrase_2
   print_output(combined)

def dollars_to_euros(dollars):
   euros = dollars * 0.99
   euros = "{:.2f}".format(dollars)
   print_output(euros)
if __name__ == "__main__":
   print_output("Hello World")

Now in the address bar where the python file exists, type CMD and press enter as shown in this screenshot

In the command terminal, type python myfile.py and your python file will execute

Answer 2

According to my VSCode's Python Extension, there are multiple issues in this code. I tried to correct the errors:

import math


def print_output(i):
   print (f"OUTPUT {i}")

def triangle_hypotenuse(side_1, side_2):
   h = math.sqrt((side_1 ** 2) + (side_2 ** 2))
   h = "{:.2f}".format(h)
   print_output(h)

def feet_to_meters(feet):
   meters = feet/3.281
   meters = "{:.4f}".format(meters)
   print_output(meters)

def polar_coords(x,y):
   radius = math.sqrt( x * x + y * y )
   theta = math.atan(y/x)
   theta = 180 * theta/math.pi
   r = "{:.2f}".format(radius)
   t = "{:.2f}".format(theta)
   phrase_1 = "r: " + r
   phrase_2 = "theta: " + t
   combined = phrase_1 + phrase_2
   print_output(combined)

def dollars_to_euros(dollars):
   euros = dollars * 0.99
   euros = "{:.2f}".format(dollars)
   print_output(euros)


print_output("Hello World")

Corrections:

1. I am not sure if it is due to copy-paste, but the indication is wrong for the time being. The first space character before each line had to be removed.
2. The expression sqrt((side_1 ** 2) + (side_2 ** 2)) = h is invalid.
3. There is a ) missing at the end of the function dollars_to_euros .

Answer 3

To run your function the computer needs to know where to look for it. If you run the functions straight in the command line will not work unless you have written the function there too.

You have probably saved your code in a file, for example test.py. Add this at the top or at the bottom of the code. And run the file either in your interpreter (vscode, intellij, pycharm, python's own or whatever).

def print_output(i):
   print (f"OUTPUT {i}")
.
.
.
print_output("hello")