Python check is floating

Check if a number is integer or decimal in Python

This article explains how to check if a number is an integer or a decimal in Python.

See the following article for how to get the fractional and integer parts.

See the following article to check if a string is a number.

Check if an object is int or float : isinstance()

You can get the type of an object with the built-in type() function.

i = 100 f = 1.23 print(type(i)) print(type(f)) # # 

You can also check if an object is of a specific type with the built-in isinstance() function.

print(isinstance(i, int)) # True print(isinstance(i, float)) # False print(isinstance(f, int)) # False print(isinstance(f, float)) # True 

In this case, only the type is checked, so you cannot check if the value of float is an integer (i.e., if the fractional part is 0).

f_i = 100.0 print(type(f_i)) # print(isinstance(f_i, int)) # False print(isinstance(f_i, float)) # True 

Check if float is an integer: is_integer()

float has the is_integer() method that returns True if the value is an integer and False otherwise.

f = 1.23 print(f.is_integer()) # False f_i = 100.0 print(f_i.is_integer()) # True 

For example, you can define a function that returns True for an integer number ( int or integer float ). This function returns False for str .

def is_integer_num(n): if isinstance(n, int): return True if isinstance(n, float): return n.is_integer() return False print(is_integer_num(100)) # True print(is_integer_num(1.23)) # False print(is_integer_num(100.0)) # True print(is_integer_num('100')) # False 

Check if a numeric string represents an integer

If you want to check if a numeric string represents an integer value, you can use the following function:

This function attempts to convert the value to float using float() . If the conversion is successful, it calls the is_integer() method and returns the result.

def is_integer(n): try: float(n) except ValueError: return False else: return float(n).is_integer() print(is_integer(100)) # True print(is_integer(100.0)) # True print(is_integer(1.23)) # False print(is_integer('100')) # True print(is_integer('100.0')) # True print(is_integer('1.23')) # False print(is_integer('string')) # False 

See the following articles for details on converting strings to numbers and handling exceptions with try . except . .

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How to Check number is float Python

In this post, we are going to learn how to Check numbers float in Python by using some built-in functions. We will ask the user to input a number and check the type of input based on whether it returns True or False. isinstance() and regular expression.

How to Check number is float Python

• type() :use type() function to check input number is float
• isinstance(): use to check if the number is float
• Regular Expression: to check float input is a floating-point number.
• Regular Expression: check if a string is a floating-point number in python using Regular Expression

1. Check number is float using type() function

In this Python program example, We will learn how to check if the number is float python using a built-in type() function to check if the input number is floating. The type function will return the type of input object. If it returns float that means input is float type Else it is not a float number. Let us understand with the below program.

input_num = eval(input("Please Enter input a number :")) if type(input_num) ==float: print("Number is Float",type(input_num)) else : print('input number is not float')

Please Enter input a number :9.3 Number is Float Please Enter input a number :14 input number is not float

2. How to Check number is float python using isinstance()

Python inbuilt isinstance() function checks if a number has type float. The isinstance() function returns True if given an object of the specified type is float. In this example, we are checking if the input_num object is of a specified type float. using isinstance () function.

3. Regex Expression to check input number is float

In this python program example, we have used the regular expression to check the input number is float use regular expression in python first we have to import the module “Re” and define a regular expression that validates the input number as float by using re.search() method.

• We are asking the user to input a number.
• the re module search() method takes input number and Regular Expression to check input number is a float.
• It returns true if the input is float and False if not a float number.

#How to Check number is float Python import re input_num = input("Please Enter input :") regex = '[-+]?\d*\.\d+|\d+"' def check_num(input_num): if(re.search(regex, input_num)): print("Input is Floating point number") else: print("Input is not a Floating point number") check_num(input_num)

Please Enter input :45.9 Input is Floating point number

4. Regular Expression to check input string is float

In this Python program example, we have defined a regular expression to check if the input string is a floating-point number. The regular expression checks the input number is float return True and False. We have used the Python re module search() method.

• We are asking the user to input a string floating-point number.
• Using re module search method that takes input number and a regular expression and returns True or False
  • If the input number is a Float it will return True
  • if the input number is not a Float it will return False.

  import re input_num = input("Please Enter input :") regex = '[+-]?5+\.8+' def check_num(input_num): if(re.search(regex, input_num)): print("Input is Floating point number") else: print("Input is not a Floating point number") check_num(input_num)

  Please Enter input :"56.9" Input is Floating point number

  Summary

  In this post, we have learned how to check if a number is float in Python by using python built-in function type(), isinstance(), and regular expression with python code example

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  Python Check if a String is a Float

  

  A string is any collection of characters that is surrounded by single or double-quotes marks and interpreted literally by a script. More specifically, a string that involves several lines is called a multiline string. The floating points are one of the most common built-in numeric data types having decimal points. Changing the integral value is quite easy. However, the transformation of the floating number is much more complicated.

  This guide will provide a way to check if a string is float or not in Python.

  How to Check if a String is a Float in Python?

  To check if a string is a float in Python, the below-listed methods are used:

  Method 1: Check if a String is a Float in Python Utilizing “float()” Method

  To check if a Python string is a float or not, the “float()” is used. It can transform the provided string to a float number. Moreover, it can fail to represent that the specified string is not a valid number.

  Example

  First, import the “numpy” library as an “np. Then, import the “matplotlib.pyplot” as a “plt” to manage some numeric values and manage graph:

  import matplotlib. pyplot as plt

  Now, create a string variable and initialize with the floating number:

  Next, print the above-initialized string:

  Then, use the try-except block to check if the provided string is float or not. For this purpose, we have invoked the “float()” method and passed a string as an argument. After that, we created a variable which used to store the results. If a string is not a float number then it will print the specified message”

  print ( «Is input string is a float number? » + str ( resultant_value ) )

  The value “true” as output indicates that the provided string is a float value:

  

  Method 2: Check if a String is a Float in Python Utilizing “replace()” and “isdigit()” Methods

  Another method to check if a string is a floating number or not in Python, the “replace()” and “isdigit()” method. The “replace()” method provides all instances of a substring by another. However, the “isdigit()” method is used to verify the data type of the variables.

  Example

  Call the “replace()” method with the required arguments. Then, use the “isdigit()” method. To store the results, declare a “resultant_value” variable:

  Use the “print()” built-in function to display the results of provided variable:

  

  That’s all! You have learned different ways to check whether the provided string is a float in Python.

  Conclusion

  To check if a string is float or not in Python, the “float()” method, the “replace()” method, and the “isdigit()” method can be used. All methods are Python’s built-in methods. In this guide, we have provided all possible ways to check if a string is float or not in Python.

  About the author

  Maria Naz

  I hold a master’s degree in computer science. I am passionate about my work, exploring new technologies, learning programming languages, and I love to share my knowledge with the world.

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