Merge branch 'master' of ssh://86thumbs.net:3022/waldek/python_course_doc

learning_python3.md

@@ -518,7 +518,7 @@ else:
 
 ## Some links to read up on
 
-* how to to [str.isfloat()](https://stackoverflow.com/questions/736043/checking-if-a-string-can-be-converted-to-float-in-python)?
+* how to convert string to float, Look at the response here: [str.isfloat()](https://stackoverflow.com/questions/736043/checking-if-a-string-can-be-converted-to-float-in-python)?
 
 # A text based adventure game
 
@@ -711,7 +711,7 @@ function_scope(300, 400)
 print("outside the function", total)
 ```
 
-Here `total` outside of the function references a different object from the `total` inside of the function.
+Here, there is a variable `total` outside the function references.But, it is a different object from the `total` inside the function.
 Python is very *nice* and will try to fix some common mistakes or oversights by itself.
 For example.
 
@@ -1369,6 +1369,34 @@ if __name__ == "__main__":
 
 </details>
 
+#Logical Operators
+
+There is three types of logical operators. All operators returns boolean.
+
+| Operator        | Result                                       |
+|-----------------|----------------------------------------------|
+| **And**         | It send 'True' if all conditions are true    |
+| **Or**          | It send 'True' if one of conditions are true |
+| **Not**         | It reverse the boolean result                |
+
+
+Let's start example with 'And' operator!
+
+```python3
+CustomerName = "Jean"
+CustomerAgreement = True
+
+DealerName = "Paul"
+DealerAgreement = True
+
+if CustomerAgreement and DealerAgreement :
+    print(f"Youpi !!! {CustomerName} and {DealerName} are agreed ")
+else:
+    print(f"Oh no {CustomerName} and {DealerName} are disagreed ;( ")
+```
+As you can guess, Jean and Paul are agreeing to the deal. If I had put 'False' in DealerAgreement, the result will be inverse.
+
+
 # Lists
 
 The different built-in objects we've seen until now, such as `str` and `int` are simple [text](https://docs.python.org/3/library/stdtypes.html#text-sequence-type-str) and [numeric](https://docs.python.org/3/library/stdtypes.html#numeric-types-int-float-complex) types.