First, why do you want to convert the float string to an integer? Do you want to treat 4.7 as meaning the user has guessed 4? Or 5? Or a legal but automatically-invalid guess? Or as actually the value 4.7 [in which case you don't want integers at all]? Or…?
Second, the way you're approaching this is wrong. userGuess.isalpha[] only tells you that the guess is made entirely of letters. That means you're still going to treat, say, "Hello!" as
a number, because it has at least one non-letter.
If you want to know if a string is a valid integer, just call int on it, and use a try/except to handle the case where it isn't:
def validateInput[]:
while True:
global userGuess
userGuess = input["Please enter a number from 1 to 100. "]
try:
userGuess = int[userGuess]
print[type[userGuess], "after int succeeeded"]
break
except ValueError:
print["Please enter whole numbers only, no words."]
print[type[userGuess], "after int failed"]
return userGuess
If you want to handle actual words differently from other kinds of failure, e.g., so you can print a more specific error message, then you can check isalpha inside the except clause.
If you want to handle check whether it's a float so you can give a different error, do the same
thing—try to call float[userGuess]—inside the except clause. Or, if you want to truncate floats, change that int[userGuess] to int[float[userGuess]].
You may also want some other checks even inside the try part. For example, what if they type -23 or 178? Those are integers, but they're not numbers between 1 and 100.
Obviously, the more validation you want, the more code it takes, because each test is another line of code. So, you may want to consider moving the validation out to a separate function from the looping over input, to make it more readable.
Converting a float value to an int is done by Type conversion, which is an explicit method of converting an operand to a specific type. However, it is to be noted that such type of conversion may tend to be a lossy one [loss of data]. Converting an int value like 2 to floating-point will result in 2.0, such types of
conversion are safe as there would be no loss of data, but converting 3.4 to an int value will result in 3 leading to a lossy conversion.
Examples:
Input: 3.3 Output: 3 Input: 5.99 Output: 5
Method 1: Conversion using int[]:
To convert a float value to int we make use of the built-in int[] function, this function trims the values after the decimal point and returns only the integer/whole number part.
Syntax: int[x]
Return: integer value
Example 1: Number of type float is converted to a result of type int.
Python3
num = 9.3
print['type:',
type[num].__name__]
num =
int[num]
print['converted value:', num,
', type:', type[num].__name__]
Output
type: float converted value: 9 , type: int
Example 2: In most cases the int[] function rounds off the result to an integer lesser than or equal to the input, but the behavior is neither definite nor predictable. One such example is shown below.
Python3
num1 = 5.9
num2 =
5.99999999999999999999
num1 = int[num1]
num2 = int[num2]
print[num1, num2, sep = '\n']
Method 2: Conversion using math.floor[] and math.ceil[].
A float value can be converted to an int value no larger than the input by using the math.floor[] function, whereas it can also be converted to an int value which is the smallest integer greater than the input using math.ceil[] function. The math module is to be imported in order to use these methods.
Syntax: math.floor[x]
Parameter:
x: This is a numeric expression.
Returns: largest integer not greater than x.
Syntax: math.ceil[x]
Parameter:
x: This is a numeric expression.
Returns: Smallest integer not less than x.
Example : In the below example conversion from float to int has been achieved using the floor[] and ceil[] methods, the former returns an int no larger than the input and the latter returns the smallest integer larger than the input.
Python3
import math
num = 5.6
floor_value = math.floor[num]
ceil_value = math.ceil[num]
print["the result using floor[] : ",
floor_value ,
', type : ',type[floor_value].__name__]
print["the result using ceil[] : ",
ceil_value,
', type: ', type[ceil_value].__name__]
Output
the result using floor[] : 5 , type : int the result using ceil[] : 6 , type: int
Method#3: Conversion using round[ ].
A float value can be converted to an int value which is closet integer value if does not pass second parameter. In case of equal difference it goes toward larger integer.
Syntax: round[x]
Parameter:
x: This is a numeric expression.
Returns: integer multiple of closest.
Example : In the below example conversion from float to int has been achieved using the round[] methods, the former returns an int number which is closest to number.
Python3
num = 5.6
print[ 'Type : ', type[num].__name__]
print[ "Original number is : ", num]
value = round[num]
print[ 'Type : ',type[value].__name__]
print["the result using round : ",value]
Output
Type : float Original number is : 5.6 Type : int the result using round : 6
Method#4: Conversion using math.trunc[ ].
A float value can be converted to an int value. In case of negative number it behaves like ceiling function of math library and in case of positive number it behaves like floor function..
Syntax: math.trunc[x]
Parameter:
x: This is a numeric expression.
Returns: larger integer in case of negative number else in case of positive number smaller number.
Example : In the below example conversion from float to int has been achieved using the math.trunc[] methods, the former returns an larger int number which in case of negative number, else in case of positive number return smaller integer number.
Python3
import math
num = 5.6
num2 = -2.6
value = math.trunc[num2]
print[ 'Type of value : ',type[value].__name__]
print["the result using round : ",value]
data = math.trunc[num]
print[ 'Type of data: ',type[data].__name__]
print["the result using round : ",data]
Output
Type of value : int the result using round : -2 Type of data: int the result using round : 5