diff --git a/py/string.go b/py/string.go
index e470c01d..a987a11a 100644
--- a/py/string.go
+++ b/py/string.go
@@ -226,6 +226,9 @@ replaced.`)
return self.(String).Lower()
}, 0, "lower() -> a copy of the string converted to lowercase")
+ StringType.Dict["join"] = MustNewMethod("join", func(self Object, args Tuple) (Object, error) {
+ return self.(String).Join(args)
+ }, 0, "join(iterable) -> return a string which is the concatenation of the strings in iterable")
}
// Type of this object
@@ -755,6 +758,30 @@ func (s String) Lower() (Object, error) {
return String(strings.ToLower(string(s))), nil
}
+func (s String) Join(args Tuple) (Object, error) {
+ if len(args) != 1 {
+ return nil, ExceptionNewf(TypeError, "join() takes exactly one argument (%d given)", len(args))
+ }
+ var parts []string
+ iterable, err := Iter(args[0])
+ if err != nil {
+ return nil, err
+ }
+ item, err := Next(iterable)
+ for err == nil {
+ str, ok := item.(String)
+ if !ok {
+ return nil, ExceptionNewf(TypeError, "sequence item %d: expected str instance, %s found", len(parts), item.Type().Name)
+ }
+ parts = append(parts, string(str))
+ item, err = Next(iterable)
+ }
+ if err != StopIteration {
+ return nil, err
+ }
+ return String(strings.Join(parts, string(s))), nil
+}
+
// Check stringerface is satisfied
var (
_ richComparison = String("")
diff --git a/py/tests/string.py b/py/tests/string.py
index f2ad6e9b..d1d16cfd 100644
--- a/py/tests/string.py
+++ b/py/tests/string.py
@@ -905,6 +905,15 @@ def index(s, i):
a = "ABC"
assert a.lower() == "abc"
+doc="join"
+assert ",".join(['a', 'b', 'c']) == "a,b,c"
+assert " ".join(('a', 'b', 'c')) == "a b c"
+assert " ".join("abc") == "a b c"
+assert "".join(['a', 'b', 'c']) == "abc"
+assert ",".join([]) == ""
+assert ",".join(()) == ""
+assertRaises(TypeError, lambda: ",".join([1, 2, 3]))
+
class Index:
def __index__(self):
return 1
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