string additions also work now - be prepared #24!

jedi/evaluate/precedence.py

@@ -200,6 +200,6 @@ def _element_calculate(left, operator, right):
         if isinstance(left, iterable.Array) or is_string(left):
             return [left]
     elif operator == '+':
-        if is_number(left) and is_number(right):
+        if is_number(left) and is_number(right) or is_string(left) and is_string(right):
             return [create(left.obj + right.obj)]
     return [left, right]

test/completion/operators.py

@@ -2,6 +2,9 @@
 Test Jedi's operation understanding. Jedi should understand simple additions,
 multiplications, etc.
 """
+# -----------------
+# numbers
+# -----------------
 x = [1, 'a', 1.0]
 
 #? int() str() float()
@@ -23,3 +26,29 @@ constant = 1
 
 #? float()
 x[calculate(1)]
+
+def calculate(number):
+    return number + constant
+
+# -----------------
+# strings
+# -----------------
+
+class FooBar(object):
+    muahaha = 3.0
+    raboof = 'fourtytwo'
+
+x = 'mua' + 'ha'
+
+#? float()
+getattr(FooBar, x + 'ha')
+
+
+# github #24
+target = u''
+for char in reversed(['f', 'o', 'o', 'b', 'a', 'r']):
+    target += char
+
+answer = getattr(FooBar, target)
+##? str()
+answer