Python vs C#: Which Language Should You Learn in 2026?

Python vs C# comes down to this: Python is shorter to write and rules AI and scripting, while C# is a compiled, statically typed .NET language that runs faster and powers enterprise apps and Unity games. Here’s one line of the same report in each:

# Python
print(f"Total ${total:,.2f} from {len(orders)} orders")

// C#
Console.WriteLine($"Total ${total:N2} from {orders.Count} orders");

To keep this honest, I wrote one small sales report in both languages and ran it for real: Python 3.12.5 on one side, the .NET 7.0.403 SDK with dotnet run on the other. Both printed the exact same report.

You’ll see how the syntax, typing, number handling and speed differ, which jobs each language is good at, and which one I’d learn first.

Python vs C# at a glance

Both are general-purpose, object-oriented and free. The real differences are typing and how the code runs. Python compiles your file to bytecode and interprets it, which I explain in whether Python is a compiled language; C# compiles to IL that .NET turns into machine code.

	Python	C#
Typing	Dynamic (optional type hints)	Static, checked by the compiler
How it runs	CPython interpreter	.NET runtime with a JIT compiler
Blocks	Indentation	Curly braces and semicolons
Package manager	pip and PyPI	NuGet
Big strengths	Data science, AI, automation, web APIs	Enterprise web apps, Windows desktop, Unity games
Current version (Oct 2026)	Python 3.14	C# 14 on .NET 10 (LTS)

Neither language is tied to one operating system any more. Modern .NET runs on Windows, macOS and Linux, just like Python.

Set up Python and C# to build the same program

If you’ve never run either language, here’s the setup I used on Windows. It takes about ten minutes, and you only do it once.

1. Install Python from python.org and tick Add python.exe to PATH during setup.
2. Install the .NET SDK from Microsoft’s .NET download page (pick the current LTS release).
3. Open Command Prompt and check both with python --version and dotnet --version.
4. For Python, save code in a .py file and run python sales_report.py.
5. For C#, create a project once with dotnet new console -n csdemo, put the code in Program.cs and run dotnet run inside that folder.

An editor helps with both. VS Code handles Python and C# with the right extensions, and I compare it with PyCharm in PyCharm vs VS Code for Python. Visual Studio is the classic choice for C#.

One note on versions: my machine still has the .NET 7 SDK, which Microsoft stopped supporting in May 2024. Nothing below needs a newer version, so it runs the same on .NET 10.

On .NET 10 you can even skip the project and run a single file with dotnet run app.cs.

A sales report in Python

The test program takes six orders, totals them by state, and prints the average order and the top customer. In Python, a list of tuples and a defaultdict do most of the work:

from collections import defaultdict

orders = [
    ("Emily Carter", "TX", 1249.99),
    ("James Miller", "CA", 389.50),
    ("Olivia Brown", "NY", 2150.00),
    ("Michael Davis", "TX", 675.25),
    ("Sophia Wilson", "CA", 1820.40),
    ("Daniel Moore", "FL", 455.75),
]

total = sum(amount for _, _, amount in orders)
by_state = defaultdict(float)
for _, state, amount in orders:
    by_state[state] += amount
top = max(orders, key=lambda order: order[2])

print("October 2026 sales report")
print("-" * 30)
for state, amount in sorted(by_state.items(), key=lambda kv: kv[1], reverse=True):
    print(f"{state:<6}${amount:>12,.2f}")
print("-" * 30)
print(f"Total ${total:,.2f} from {len(orders)} orders")
print(f"Average order ${total / len(orders):,.2f}")
print(f"Top customer: {top[0]} (${top[2]:,.2f})")

Output:

October 2026 sales report
------------------------------
CA    $    2,209.90
NY    $    2,150.00
TX    $    1,925.24
FL    $      455.75
------------------------------
Total $6,740.89 from 6 orders
Average order $1,123.48
Top customer: Olivia Brown ($2,150.00)

Notice there’s no type declaration anywhere, and the f-string :,.2f handles the dollar formatting. More format tricks are in formatting a number with commas in Python.

The same sales report in C# (Python vs C# side by side)

Here’s the C# version. A record describes an order, and LINQ (Language Integrated Query, C#’s built-in query methods) replaces the loop:

using System.Globalization;

CultureInfo.CurrentCulture = CultureInfo.GetCultureInfo("en-US");

var orders = new List<Order>
{
    new("Emily Carter", "TX", 1249.99m),
    new("James Miller", "CA", 389.50m),
    new("Olivia Brown", "NY", 2150.00m),
    new("Michael Davis", "TX", 675.25m),
    new("Sophia Wilson", "CA", 1820.40m),
    new("Daniel Moore", "FL", 455.75m),
};

decimal total = orders.Sum(o => o.Amount);
var byState = orders
    .GroupBy(o => o.State)
    .Select(g => (State: g.Key, Amount: g.Sum(o => o.Amount)))
    .OrderByDescending(s => s.Amount);
Order top = orders.MaxBy(o => o.Amount)!;

Console.WriteLine("October 2026 sales report");
Console.WriteLine(new string('-', 30));
foreach (var (state, amount) in byState)
    Console.WriteLine($"{state,-6}${amount,12:N2}");
Console.WriteLine(new string('-', 30));
Console.WriteLine($"Total ${total:N2} from {orders.Count} orders");
Console.WriteLine($"Average order ${total / orders.Count:N2}");
Console.WriteLine($"Top customer: {top.Customer} (${top.Amount:N2})");

record Order(string Customer, string State, decimal Amount);

Output:

October 2026 sales report
------------------------------
CA    $    2,209.90
NY    $    2,150.00
TX    $    1,925.24
FL    $      455.75
------------------------------
Total $6,740.89 from 6 orders
Average order $1,123.48
Top customer: Olivia Brown ($2,150.00)

It’s longer, but every value has a known type before the program starts. Money uses decimal, a built-in base-10 type, so there’s no float rounding to think about.

LINQ’s GroupBy, Select and Sum feel a lot like Python’s generator expressions. If you like that style, list comprehension in Python is the closest match.

One thing the real run caught: N2 follows the computer’s regional settings. On a machine set to Indian English, it groups digits as lakhs, so I set the culture to en-US at the top. Python’s , format ignores locale.

How do Python and C# handle types?

This is the difference you’ll feel every day: Python checks types while the program runs, and C# checks them before it runs. Watch what happens when a price arrives as text instead of a number.

Python: the error shows up at run time

Type hints in Python are notes for tools and people. The interpreter ignores them, so this script prints the first result and then crashes:

def add_sales_tax(price: float, rate: float = 0.0825) -> float:
    return round(price * (1 + rate), 2)

print(add_sales_tax(19.99))
print(add_sales_tax("19.99"))   # a string slips through until this line runs

Output:

21.64
Traceback (most recent call last):
  File "C:\pyguides\tax.py", line 5, in <module>
    print(add_sales_tax("19.99"))   # a string slips through until this line runs
          ^^^^^^^^^^^^^^^^^^^^^^
  File "C:\pyguides\tax.py", line 2, in add_sales_tax
    return round(price * (1 + rate), 2)
                 ~~~~~~^~~~~~~~~~~~
TypeError: can't multiply sequence by non-int of type 'float'
tax.py:5: error: Argument 1 to "add_sales_tax" has incompatible type "str"; expected "float"  [arg-type]
Found 1 error in 1 file (checked 1 source file)

A type checker like mypy closes most of that gap, and I run it on every bigger project. Read-only values work the same way, by convention, as constants in Python shows.

C#: the compiler refuses to build

The C# version never runs at all. dotnet run stops at the build step with error CS1503:

using System.Globalization;

CultureInfo.CurrentCulture = CultureInfo.GetCultureInfo("en-US");

static decimal AddSalesTax(decimal price, decimal rate = 0.0825m) =>
    Math.Round(price * (1 + rate), 2);

Console.WriteLine(AddSalesTax(19.99m));
Console.WriteLine(AddSalesTax("19.99"));   // the compiler stops here

Output:

C:\pyguides\csdemo\Program.cs(9,31): error CS1503: Argument 1: cannot convert from 'string' to 'decimal' [C:\pyguides\csdemo\csdemo.csproj]
The build failed. Fix the build errors and run again.

That’s why large teams like C#: a whole class of bugs disappears before testing starts. The trade-off is more typing up front, and that’s why Python feels faster for small scripts.

Python vs C# numbers: integers, floats and money

Numbers behave differently too, and it’s easy to get bitten when you move between the two. Python’s integers have no size limit:

big = 2**63 - 1          # the largest value a C# long can hold
print(big)
print(big + 1)           # Python ints just keep growing
print(2**100)
print(0.1 + 0.2)         # float math
from decimal import Decimal
print(Decimal("0.10") + Decimal("0.20"))

Output:

9223372036854775807
9223372036854775808
1267650600228229401496703205376
0.30000000000000004
0.30

C# integers have a fixed size. A long wraps around to a negative number unless you ask for a checked block:

long big = long.MaxValue;
Console.WriteLine(big);
Console.WriteLine(big + 1);              // wraps around silently

try
{
    checked { Console.WriteLine(big + 1); }
}
catch (OverflowException ex)
{
    Console.WriteLine($"checked: {ex.Message}");
}

Console.WriteLine(0.1 + 0.2);            // double math
Console.WriteLine(0.10m + 0.20m);        // decimal is built in

Output:

9223372036854775807
-9223372036854775808
checked: Arithmetic operation resulted in an overflow.
0.30000000000000004
0.30

Both languages print 0.30000000000000004 for floats, because they share the same binary floating-point format. For money, use decimal in C# or the decimal module in Python. Rounding for display is covered in printing 2 decimal places in Python.

Python vs C# performance

C# is usually much faster for CPU-heavy loops, because the JIT compiles it to machine code. I timed the same ten-million-step loop in both. Here’s Python:

import time

start = time.perf_counter()
total = 0
for i in range(10_000_000):
    total += i
loop_ms = (time.perf_counter() - start) * 1000

start = time.perf_counter()
total2 = sum(range(10_000_000))
sum_ms = (time.perf_counter() - start) * 1000

print(f"Total: {total:,}")
print(f"for loop: {loop_ms:,.0f} ms")
print(f"sum(range()): {sum_ms:,.0f} ms")

Output:

Total: 49,999,995,000,000
for loop: 526 ms
sum(range()): 91 ms

And here’s C#, built in Release mode with dotnet run -c Release. The default Debug build skips optimizations, so don’t benchmark with it:

using System.Diagnostics;
using System.Globalization;

CultureInfo.CurrentCulture = CultureInfo.GetCultureInfo("en-US");

var sw = Stopwatch.StartNew();
long total = 0;
for (int i = 0; i < 10_000_000; i++)
    total += i;
sw.Stop();

Console.WriteLine($"Total: {total:N0}");
Console.WriteLine($"for loop: {sw.Elapsed.TotalMilliseconds:N0} ms&q