Python convert string to float exception7/31/2023 ![]() ![]() If you have any doubt or any suggestions to make please drop a comment. That's all for this topic Convert String to float in Python. ValueError: invalid literal for int() with base 10: '50.56' You have to firstĬonvert string to float and then to int. If there is a decimal number stored as a string and you want only the integer part then directly using int() function results in error. Getting integer part of the decimal number Output Error while conversion: could not convert string to float: 'abc' Using int () function for converting a string into integer Using the same code as in above example, except converting the string value into an integer by using int. If you are not sure about the passed number it isīetter to use try and except for exception handling.įor example in the following Python function string ‘abc’ is passed as one of the argument value which results in ValueErorr being raised while converting it. You may use the Python int and float functions for converting a string to an integer and float numbers before doing any operation, as shown in the examples below. If the string doesn’t represent a valid number that can be converted to float, ValueError is raised. To convert a Python String to a float pass that String to float() function which returns a float object constructed from the passed string. TypeError: can only concatenate str (not "float") to strĪs you can see num1 variable is of type string so Python tries to concatenate num2 to num1 rather than adding them. Output Traceback (most recent call last):įile "F:/NETJS/NetJS_2017/Python/Programs/Test.py", line 14, in If you have a float represented as String literal then you need to convert it to float value if you have to use it in any arithmetic operation. Math.In this post we’ll see how to convert String to float in Python. Is the input a positive non-zero integer?Īnd the code would go like this: input_string = input('Please enter a natural number: ')Įxcept ValueError: # The input is not a numberĮxcept ValueError: # The input is not an integer.If the intention is to use try/ except/ else blocks to check whether the requirement of the prompt of the input statement (enter a natural number) is met, and to “create” and handle exceptions for different types of non-natural number input before printing out the reciprocal, perhaps we should do the checks in the following order: When non number is entered, it raises exception in both try: value = int(value) clause and try: value = float(value) clauses, and prints out “This is not a natural number”.When zero is entered, it will raise no exception in the try clauses, but will raise Zero DivisionError when 1/value is executed.When a non integer is entered, it raises an exception in the try: value = int(value) clause but not in the try: value = float(value) clause, nothing would be done.But when a negative positive integer, which is not a natural number, is entered, it also raises no exception and prints out the reciprocal, which may not fit the prompt of the input statement.When a non-zero positve integer is entered, it raises no exception and prints out the reciprocal, which should be a welcomed response. ![]() If the intention is to avoid raising exception when non-number is entered, replacing finally block with else block like the following would do the job: value = input('Please enter a natural number: ')īut when different cases of input are tried, it’s response may not look good: TypeError: unsupported operand type(s) for /: 'int' and 'str' ValueError: could not convert string to float: 'no'įile "/usr/lib/python3.7/_sitebuiltins.py", line 26, in _call_ ![]() ValueError: invalid literal for int() with base 10: 'no'ĭuring handling of the above exception, another exception occurred: In the below example we have converted the string to a float list. Print('The reciprocal of', value, 'is', 1/value) Firstly, we need to initialize the string and then we will use float () and split () methods to perform the task. Python beginner here, if anyone could explain why this code gives me a giant error I would be very thankful.Ĭode: value = input('Please enter a natural number: ')
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