Added the practice code files

sreekanthpogula · sreekanthpogula · commit 38a32f2f3ae5 · 2023-03-30T10:24:44.000+05:30
diff --git a/practice.py b/practice.py
@@ -0,0 +1,81 @@
+# # Yield from
+# def yieldOnly():
+#     yield "Sreekanth"
+#     yield "Sourav"
+#     yield "Satyamani"
+
+# def yieldFrom():
+#     for i in [1]:
+#         yield from yieldOnly()
+    
+# test = yieldFrom()
+# for i in test:
+#     print(i)
+
+# # lazy evaluation
+# def fibonacci():
+#     a, b = 0, 1
+#     while True:
+#         yield a
+#         a, b = b , a + b
+
+# fibonacci_Seq  = (n for i, n in enumerate(fibonacci()) if i < 10)
+
+# for n in fibonacci_Seq:
+#     print(n)
+
+# # reading files using generators
+# def pdf_reader(file_name):
+#     for row in open (file_name, "r"):
+#         yield row
+
+# pdf_gen = pdf_reader("testfile.txt")
+# row_count = 0 
+
+# for row in pdf_gen:
+#     row_count += 1
+
+# print(f"Row count is {row_count}")
+# pdf_gen = (row for row in open("testfile.txt"))   
+
+# generator_methods
+def isEven(n):
+    if n % 2 == 0:
+        return True
+    else:
+        return False
+    
+def get_Even():
+    value = 0 
+    while True:
+        if isEven(value):
+            i = yield value
+            if i is not None:
+                value = i
+        value += 1
+
+even_gen = get_Even()
+print(next(even_gen))
+print(even_gen.send(1))
+# it allows you to .send() a value back to the generator.
+print(next(even_gen))
+
+for x in even_gen:
+    if x < 10:
+        even_gen.throw(ValueError, "I, THINK IT WAS ENOUGH!")
+        # .throw() allows you to throw exceptions with the generator.
+        print(x)
+
+for x in even_gen:
+    if x > 10:
+        even_gen.close() .close() 
+        # .close() allows you to stop a generator. This can be especially handy when controlling an infinite sequence generator. 
+    print(x)
+
+# generator with context manager
+def read_lines(filename):
+    with open(filename) as f:
+        for line in f:
+            yield line.strip()
+for line in read_lines("testfile.txt"):
+   print(line)
