Learning C# as a python programmer

Python:
single line comments start with #.
multi-line comments start with ”’ and end with ”’ on their own lines

# this is a comment
'''
this is a
multi-line comment
'''

C#:
single line comments start with //.
multi-line comments start with /* and end with */

// this is a comment
/*
this is a multi-line comment
*/

Python:
statements end with a new line. statements can only wrap into the next line if there is an open parentheses or bracket.

print("this is long but it's okay
   because of the parentheses")

C#:
statements end with a semi-colon. any statement can be wrapped into multiple lines.


Console.WriteLine("this is long
   but the statement won't end
   until the semi-colon);

Python:
uses indentation to separate blocks of code.



if a < b
   foo(a)
else
   foo(b)
   bar(b)

C#:
uses {} to separate blocks of code. braces can be omitted if the block is one line, but if/else statements should always match in their use of braces

if (a < b) {
   foo(a);
else {
   foo(b);
   bar(b);
}

Python:
types do not have to be explicitly declared. python will automatically convert types in some situations



x = 1
y = "hello"

C#:
types must be explicitly declared. If you initialize the variable in the same line as declaration, you can use the “var” keyword to have the compiler determine the type.

int x;
var y = "hello"

Python:
can create a list or array without declaring the type. can have lists or arrays of multiple types


myList = [1, "two", 3.5]

C#:
must declare the type of variable in a list or array. cannot have lists or arrays of multiple types (unless they are of classes derived from the same parent class)

var myList = new List<int>();
myList.Add(1);

Python:
use = to compare values in an if.


if a = b

C#:
use == to compare values in an if. surround values being compared by ()

if (a == b)

Python:
loop using

for i in range(0,10)

C#:
loop using

for (int i = 0; i < 10; i++)

Python:
iterate using

for item in myList

C#:
iterate using

foreach (var item in myList)