add Day4 part one

Author: simonvbrae

day4/day4.py

@@ -0,0 +1,26 @@
+# importing the module
+import doctest
+import regex as re
+
+def solve_1(passport):
+    print(passport)
+    header_pattern = re.compile(r"[a-z][a-z][a-z]:")
+    
+    present_headers=[m[:-1] for m in re.findall(header_pattern, passport)]
+    
+    required_fields=['ecl', 'pid', 'eyr', 'hcl', 'byr', 'iyr', 'hgt']
+    for i in required_fields:
+        if i not in present_headers:
+            return False
+    return True
+
+def main():
+    f=open("input", "r")
+    lines=f.read().split("\n\n")
+
+    valid_passport_amount=0
+    for l in lines:
+        valid_passport_amount+=int(solve_1(l))
+    print(valid_passport_amount)
+
+main()