Data commit

Task/Determine-if-a-string-is-numeric/Python/determine-if-a-string-is-numeric-1.py

@@ -0,0 +1,8 @@
+def is_numeric(s):
+    try:
+        float(s)
+        return True
+    except (ValueError, TypeError):
+        return False
+
+is_numeric('123.0')

Task/Determine-if-a-string-is-numeric/Python/determine-if-a-string-is-numeric-2.py

@@ -0,0 +1 @@
+'123'.isdigit()

Task/Determine-if-a-string-is-numeric/Python/determine-if-a-string-is-numeric-3.py

@@ -0,0 +1,13 @@
+def is_numeric(literal):
+    """Return whether a literal can be parsed as a numeric value"""
+    castings = [int, float, complex,
+        lambda s: int(s,2),  #binary
+        lambda s: int(s,8),  #octal
+        lambda s: int(s,16)] #hex
+    for cast in castings:
+        try:
+            cast(literal)
+            return True
+        except ValueError:
+            pass
+    return False

Task/Determine-if-a-string-is-numeric/Python/determine-if-a-string-is-numeric-4.py

@@ -0,0 +1,23 @@
+def numeric(literal):
+    """Return value of numeric literal or None if can't parse a value"""
+    castings = [int, float, complex,
+        lambda s: int(s,2),  #binary
+        lambda s: int(s,8),  #octal
+        lambda s: int(s,16)] #hex
+    for cast in castings:
+        try:
+            return cast(literal)
+        except ValueError:
+            pass
+    return None
+
+
+tests = [
+    '0', '0.', '00', '123', '0123', '+123', '-123', '-123.', '-123e-4', '-.8E-04',
+    '0.123', '(5)', '-123+4.5j', '0b0101', ' +0B101 ', '0o123', '-0xABC', '0x1a1',
+    '12.5%', '1/2', '½', '3¼', 'π', 'Ⅻ', '1,000,000', '1 000', '- 001.20e+02',
+    'NaN', 'inf', '-Infinity']
+
+for s in tests:
+    print("%14s -> %-14s %-20s is_numeric: %-5s  str.isnumeric: %s" % (
+        '"'+s+'"', numeric(s), type(numeric(s)), is_numeric(s), s.isnumeric() ))

Task/Determine-if-a-string-is-numeric/Python/determine-if-a-string-is-numeric-5.py

@@ -0,0 +1,5 @@
+import re
+numeric = re.compile('[-+]?(\d+(\.\d*)?|\.\d+)([eE][-+]?\d+)?')
+is_numeric = lambda x: numeric.fullmatch(x) != None
+
+is_numeric('123.0')