Python to C# Cheat Sheet

Variables

Python:

foo = 1
bar = "hi"
something_that_varies = 2 # Though strict immutability in Python isn't common.
something_that_varies += 1

C#:

var foo = 1; // Equivalent to: int foo
var bar = "hi"; // Equivalent to: String bar
var somethingThatVaries = 2; // Equivalent to: int somethingThatVaries
somethingThatVaries++;

Functions

Python:

# Function definition: takes an argument
def do_domething(some_argument):
  return some_argument + 1


# Function use
results = do_something(3)

C#:

// Function definition: takes an integer argument, returns an integer
static int DoSomething(int some_argument)
{
  return some_argument + 1;
}

// Function use
var results = DoSomething(3);

Conditionals

Python:

if x == 3:
    # ...
elif x == 0:
    # ...
else:
    # ...

C#:

if (x == 3)
{
  // ...
}
else if (x == 0)
{
  // ...
}
else
{
  // ...
}

// Or using a switch:
switch(x) {
  case 3:
    // ...
    break;
  case 0:
    // ...
    break;
  default:
    // ...
    break;
}

Output to the screen

Python:

x = 5
print("x has the value %s" % x);

C#:

var x = 5;
Debug.Log("x has the value {0}", x);

Lists of variable size

Python:

i = ["a", "b", "c"];
i.append("d"); 
print(i[1]); # outputs b

C#:

var i = new List<String>() { "a", "b", "c" };
i.Add("d");
Debug.Log(i[1]); // outputs b

Iterating over the elements in a list

Rust:

i = ["a", "b", "c"];
for j in i:
    print(j):

C#:

var i = new List<String>() { "a", "b", "c" };

foreach(var j in i) {
  Debug.Log(j);
}

i.ForEach((j) => Debug.Log(j));