1 files changed, 45 insertions, 0 deletions
diff --git a/challenge-287/eric-cheung/python/ch-2.py b/challenge-287/eric-cheung/python/ch-2.py
new file mode 100755
index 0000000000..ede897bb14
--- /dev/null
+++ b/challenge-287/eric-cheung/python/ch-2.py
@@ -0,0 +1,45 @@
+
+def IsValidDef (strFunc, bAllowDecimal):
+    if not bAllowDecimal and "." in strFunc:
+        return False
+
+    if strFunc == ".":
+        return False
+
+    if (strFunc[0] in ["+", "-"]):
+        strFunc = strFunc[1:]
+
+    arrPart = strFunc.split(".")
+
+    if len(arrPart) > 2:
+        return False
+
+    for strLoop in arrPart:
+        if not strLoop:
+            continue
+        if not strLoop.isnumeric():
+            return False
+
+    return True
+
+def IsValidNum (strFunc):
+    arrPart = strFunc.lower().split("e")
+
+    if len(arrPart) > 2:
+        return False
+
+    for nIndx, strLoop in enumerate(arrPart):
+        if not IsValidDef (strLoop, nIndx == 0):
+            return False
+
+    return True
+
+## strInput = "1"  ## Example 1
+## strInput = "a"  ## Example 2
+## strInput = "."  ## Example 3
+## strInput = "1.2e4.2"  ## Example 4
+## strInput = "-1."  ## Example 5
+## strInput = "+1E-8"  ## Example 6
+strInput = ".44"  ## Example 7
+
+print (IsValidNum(strInput))