# Get integer and decimal parts of a number at the same time with math.modf in Python

The modf() function of math, the standard module for mathematical functions in Python, can be used to obtain the integer and decimal parts of a number simultaneously.

See the following article for divmod(), which simultaneously obtains the quotient and remainder of a division.

## Get integer and decimal parts without math module

Applying int() to a floating-point float type yields an integer value with the decimal point truncated. This can be used to obtain the integer part and the decimal part.

``````a = 1.5

i = int(a)
f = a - int(a)

print(i)
print(f)
# 1
# 0.5

print(type(i))
print(type(f))
# <class 'int'>
# <class 'float'>
``````

## Get integer and decimal parts of a number simultaneously with math.modf()

The function modf() in the math module can be used to simultaneously obtain the integer and decimal parts of a number.

math.modf() returns the following tuple Note the order, since the decimal part comes first.

• `(decimal, integer)`
``````import math

print(math.modf(1.5))
print(type(math.modf(1.5)))
# (0.5, 1.0)
# <class 'tuple'>
``````

Each can be unpacked and assigned to a separate variable as follows Both integer and decimal parts are float types.

``````f, i = math.modf(1.5)

print(i)
print(f)
# 1.0
# 0.5

print(type(i))
print(type(f))
# <class 'float'>
# <class 'float'>
``````

The sign will be the same as the sign of the original value for both integer and decimal parts.

``````f, i = math.modf(-1.5)

print(i)
print(f)
# -1.0
# -0.5
``````

Applicable to int types. In this case, both integer and decimal parts are float types.

``````f, i = math.modf(100)

print(i)
print(f)
# 100.0
# 0.0
``````

The following method can be used to check whether a float type is an integer (i.e., the decimal part is 0) without obtaining the decimal part. See the following article.

• `float.is_integer()`
follow
From-Locals
Copied title and URL