I am able to convert a list of numbers to a list of strings in the code editor following the answer provided here (more or less):

var numbers = ee.List.sequence(0, 4);
var number_to_string = function(number) {
  return ee.String(ee.Number(number).int());
var strings = numbers.map(number_to_string);


["0","1","2","3","4"] <- strings as expected

However, when I try to run the same code (reformatted) in the Python API, the output list still contains numbers, not strings:

numbers = ee.List.sequence(0, 4);
def number_to_string(number):
    return ee.String(ee.Number(number).int());
strings = numbers.map(number_to_string);

[0, 1, 2, 3, 4]

[0, 1, 2, 3, 4] <- Why aren't these strings?

How can I force the conversion of a list of numbers to a list of strings in the Python API?

1 Answer 1


In general, you can't just cast from one type to another like that, unless the types are part of the same type hierarchy (ie: Images are also Features)

Use ee.Number(number).format("%d")

The JavaScript API might have gotten updated to look for numbers in the String constructor. It looks like the Python API didn't.

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