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Add two numbers with the + operator
Place + between the two numeric values:
print(2 + 3) # 5Python evaluates the expression and print() displays its result. The operator is the addition method; no special function, package, calculator app, or paid service is required. The Python Software Foundation’s Python tutorial describes + as an arithmetic operator.
Store the result in a variable
When you need to use the answer later, assign the sum to a name:
a = 2
b = 3
total = a + b
print(total) # 5+ performs the addition; = assigns the resulting value to total. These operators have different jobs.
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Put the addition in a reusable function
For a one-off sum, a function adds unnecessary structure. If you want to reuse the operation, define one that returns the result:
def add_two_numbers(a, b):
return a + b
print(add_two_numbers(2, 3)) # 5The function accepts two arguments, adds them with the same + operator, and returns the sum.
Choose a numeric type that fits the values
Python’s built-in numeric types include int, float, and complex. The standard library also provides Decimal and Fraction. For addition, the practical choice depends on what the numbers represent:
| Type | Use it for | What to know |
|---|---|---|
int |
Whole numbers | Python documents integers as having unlimited precision. See Built-in Types. |
float |
Most general calculations and approximate measurements | Many decimal fractions are approximated in binary, though floating-point arithmetic is adequate for most tasks. See Floating-Point Arithmetic: Issues and Limitations. |
Decimal |
Calculations where exact decimal representation matters, such as accounting-style values | Construct values from decimal strings to avoid first introducing a float approximation. |
Fraction |
Values that need exact rational representation | Available in Python’s standard library; see Numeric and Mathematical Modules. |
Combining an integer and a float produces floating-point arithmetic. For ordinary values, the simple expression remains a + b; choose a different representation only when the required precision calls for it.
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Use Decimal when decimal exactness matters
For example, create Decimal values from strings rather than converting floats:
from decimal import Decimal
subtotal = Decimal('0.10') + Decimal('0.20')
print(subtotal) # 0.30This keeps the decimal inputs exact. By contrast, a float stores many decimal fractions only approximately, so a calculation can display a result that differs slightly from the decimal value you expect. The Python tutorial explains the limits of binary floating-point representation; its standard-library tour shows Decimal for exact decimal arithmetic.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Adding many floating-point values
For a short calculation, use + as usual. When summing a collection of float values, Python documents sum() and math.fsum() as options; math.fsum() can reduce accumulated rounding error in relevant cases. It is not necessary for adding just two ordinary values. See the Python documentation on floating-point arithmetic.
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