Facilitates sub-classing and user customization by using super()

  Using super() instead of hard-coding the class name enables the class to
be sub-classed more easily.

Author: Fernando Governatore

barcode/codex.py

@@ -71,7 +71,7 @@ def build(self):
     def render(self, writer_options=None, text=None):
         options = {"module_width": MIN_SIZE, "quiet_zone": MIN_QUIET_ZONE}
         options.update(writer_options or {})
-        return Barcode.render(self, options, text)
+        return super().render(options, text)
 
 
 class PZN7(Code39):
@@ -98,7 +98,7 @@ def __init__(self, pzn, writer=None):
             )
         self.pzn = pzn
         self.pzn = "{}{}".format(pzn, self.calculate_checksum())
-        Code39.__init__(self, "PZN-{}".format(self.pzn), writer, add_checksum=False)
+        super().__init__("PZN-{}".format(self.pzn), writer, add_checksum=False)
 
     def get_fullcode(self):
         return "PZN-{}".format(self.pzn)
@@ -248,7 +248,7 @@ def build(self):
     def render(self, writer_options=None, text=None):
         options = {"module_width": MIN_SIZE, "quiet_zone": MIN_QUIET_ZONE}
         options.update(writer_options or {})
-        return Barcode.render(self, options, text)
+        return super().render(options, text)
 
 
 class Gs1_128(Code128):

barcode/ean.py

@@ -125,7 +125,7 @@ def to_ascii(self):
     def render(self, writer_options=None, text=None):
         options = {"module_width": SIZES["SC2"]}
         options.update(writer_options or {})
-        return Barcode.render(self, options, text)
+        return super().render(options, text)
 
 
 class EuropeanArticleNumber13WithGuard(EuropeanArticleNumber13):
@@ -150,12 +150,12 @@ class JapanArticleNumber(EuropeanArticleNumber13):
 
     valid_country_codes = list(range(450, 460)) + list(range(490, 500))
 
-    def __init__(self, jan, writer=None):
-        if int(jan[:3]) not in JapanArticleNumber.valid_country_codes:
+    def __init__(self, jan, *args, **kwargs):
+        if int(jan[:3]) not in self.valid_country_codes:
             raise WrongCountryCodeError(
                 "Country code isn't between 450-460 or 490-500."
             )
-        EuropeanArticleNumber13.__init__(self, jan, writer)
+        super().__init__(jan, *args, **kwargs)
 
 
 class EuropeanArticleNumber8(EuropeanArticleNumber13):
@@ -172,9 +172,6 @@ class EuropeanArticleNumber8(EuropeanArticleNumber13):
 
     digits = 7
 
-    def __init__(self, ean, writer=None, guardbar=False):
-        EuropeanArticleNumber13.__init__(self, ean, writer, guardbar=guardbar)
-
     def build(self):
         """Builds the barcode pattern from `self.ean`.
 

barcode/isxn.py

@@ -48,7 +48,7 @@ def __init__(self, isbn, writer=None):
         if isbn[:3] == "979":
             if isbn[3:5] not in ("10", "11"):
                 raise BarcodeError("ISBN must start with 97910 or 97911.")
-        EuropeanArticleNumber13.__init__(self, isbn, writer)
+        super().__init__(isbn, writer)
 
 
 class InternationalStandardBookNumber10(InternationalStandardBookNumber13):
@@ -71,7 +71,7 @@ def __init__(self, isbn, writer=None):
         isbn = isbn[: self.digits]
         self.isbn10 = isbn
         self.isbn10 = "{}{}".format(isbn, self._calculate_checksum())
-        InternationalStandardBookNumber13.__init__(self, "978" + isbn, writer)
+        super().__init__("978" + isbn, writer)
 
     def _calculate_checksum(self):
         tmp = sum(x * int(y) for x, y in enumerate(self.isbn10[:9], start=1)) % 11
@@ -104,7 +104,7 @@ def __init__(self, issn, writer=None):
         issn = issn[: self.digits]
         self.issn = issn
         self.issn = "{}{}".format(issn, self._calculate_checksum())
-        EuropeanArticleNumber13.__init__(self, self.make_ean(), writer)
+        super().__init__(self.make_ean(), writer)
 
     def _calculate_checksum(self):
         tmp = (

barcode/itf.py

@@ -73,4 +73,4 @@ def render(self, writer_options, text=None):
             "quiet_zone": MIN_QUIET_ZONE,
         }
         options.update(writer_options or {})
-        return Barcode.render(self, options, text)
+        return super().render(options, text)

barcode/upc.py

@@ -108,7 +108,7 @@ def to_ascii(self):
     def render(self, writer_options=None, text=None):
         options = {"module_width": 0.33}
         options.update(writer_options or {})
-        return Barcode.render(self, options, text)
+        return super().render(options, text)
 
 
 UPCA = UniversalProductCodeA