update

Signed-off-by: Harmouch101 <mahmoudddharmouchhh@gmail.com>

Author: wiseaidev

.travis.yml

@@ -2050,6 +2050,76 @@ StopIteration
 128
 ```
 
+### 3.11.3 Generator Exercices. <a name="3.11.3"></a><h5>[Go To TOC](#TOC).</h5>
+
+```python
+>>> def factorial():
+...     prod = n = 1
+...     while True:
+...           yield prod
+...           prod *= n
+...           n += 1
+... 
+>>> fact_gen = factorial()
+>>> fact_gen
+<generator object factorial at 0x7fc7eac497d0>
+>>> hasattr(fact_gen, "__next__")
+True
+>>> next(fact_gen)
+1
+>>> next(fact_gen)
+1
+>>> next(fact_gen)
+2
+>>> next(fact_gen)
+6
+>>> next(fact_gen)
+24
+>>> next(fact_gen)
+120
+>>> next(fact_gen)
+720
+>>> next(fact_gen)
+5040
+>>> def odds_v0():
+...     result = []
+...     for n in range(1,10,2):
+...         result.append(n)     
+...     return result
+... 
+>>> def odds_v1():
+...     result = []
+...     for n in range(1,10,2):
+...         yield n
+... 
+>>> odds_v0()
+[1, 3, 5, 7, 9]
+>>> odds_v1()
+<generator object odds_v1 at 0x7fc7eab74cd0>
+>>> list(odds_v1())
+[1, 3, 5, 7, 9]
+>>> odds = odds_v1()
+>>> next(odds)
+1
+>>> next(odds)
+3
+>>> next(odds)
+5
+>>> next(odds)
+7
+>>> next(odds)
+9
+>>> next(odds)
+Traceback (most recent call last):
+  File "<stdin>", line 1, in <module>
+StopIteration
+>>> timeit.timeit('for n in odds_v0(): pass', 'from __main__ import odds_v0', number=1000000)
+1.2579899600004865
+>>> timeit.timeit('for n in odds_v1(): pass', 'from __main__ import odds_v1', number=1000000) # iterating over a generator is slightly faster 
+1.1573705800001335
+```
+
+
 ### 3.12 Input. <a name="3.12"></a><h5>[Go To TOC](#TOC).</h5>
 
 Using the built-in `input()` method, you can get information from the user. It has an optional parameter `prompt` which prints a string on the screen.

Chapter_01: The Language Basics.md

@@ -1855,3 +1855,38 @@ To move the pointer to a given position, use the seek() function.
 
 ### 2.3 Writing to a file. <a name="2.3"></a>
 
+The `write()` function is used to write to a file opened in write mode. If the file does not exist, then a new one will be created.
+
+```python
+>>> f = open('file1.txt', 'w')
+>>> help(f.write)
+
+write(text, /) method of _io.TextIOWrapper instance
+    Write string to stream.
+    Returns the number of characters written (which is always equal to
+    the length of the string).
+
+>>> f.write('Hi \n There!')
+11
+>>> len('Hi \n There!')
+11
+```
+
+### 2.4 Closing a file. <a name="2.4"></a>
+
+The `close()` method automatically closes the file, and any unsaved information is lost.
+
+```python
+>>> f = open('file1.txt', 'r')
+>>> f.readline()
+'Hi \n'
+>>> f.readline()
+' There!'
+>>> f.closed
+False
+>>> f.close()
+>>> f.closed
+True
+```
+
+

Chapter_02: Functions, File IO, Generators.md

@@ -1,4 +1,4 @@
-# Python-3-Notes
+# Python-3-Resources
 
 This repository is used to be documentation during my journey in mastering the python programming language while reading plenty of books and tons of online resources.