Strings ​

The type of SmartPy strings is sp.TString.

The corresponding type in Michelson is

Michelson string

See reference Strings and Bytes template.

Literals ​

"...", '...' or sp.string(s)
Strings in SmartPy are introduced by simply using regular Python strings of the form "..." or '...', or by using sp.string(s) where s is a Python string.

Example ​

aString1 = "Hello World"
aString2 = sp.string("Hello World")

Operations ​

Concatenation ​

expr1 + expr2
Concatenate two sequences of sp.TString.

Example ​

"Hello" + " " + "World" # Hello World

sp.concat(<l>)
Concatenate a list l of sp.TString.

Example ​

sp.concat(["Hello", " ", "World"]) # Hello World

Michelson CONCAT

Obtaining Size ​

sp.len(<expression>)
Return the length of <expression>.

Example ​

size = sp.len("A String")

Michelson SIZE

Slicing ​

sp.slice(<expression>, offset=<offset>, length=<length>)
Slice expression of type sp.TString from offset for length characters.

It returns an expression of type sp.TOption(sp.TString).

Example ​

sp.slice("Hello World", 0, 5) # sp.some("Hello")

Michelson SLICE