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--- notes_pythons [2018/01/25 16:08]
gbdivers
+++ notes_pythons [2018/02/06 14:32] (Version actuelle)
gbdivers
@@ Ligne 751: / Ligne 751: @@
 Phone.G3()
 </code>
+===== Files I/O =====
+<code python>
+#Printing to the Screen
+print ("Python is really a great language,", "isn't it?")
+#The input Function
+x = input("something:")
+</code>
+<code python>
+# The open Function
+file object = open(file_name [, access_mode][, buffering])
+access_mode = r/r+/w/w+/a, b
+# Open a file
+fileObject.close();
+fo = open("foo.txt", "wb")
+print ("Name of the file: ", fo.name)
+print ("Closed or not : ", fo.closed)
+print ("Opening mode : ", fo.mode)
+fo.close()
+# The write() Method
+fileObject.write(string);
+fo = open("foo.txt", "w")
+fo.write( "Python is a great language.\nYeah its great!!\n")
+fo.close()
+# The read() Method
+fileObject.read([count]);
+fo = open("foo.txt", "r+")
+str = fo.read(10)
+print ("Read String is : ", str)
+fo.close()
+# File Positions
+position = fo.tell()
+position = fo.seek(0, 0)
+# Renaming and Deleting Files
+os.rename(current_file_name, new_file_name)
+os.remove(file_name)
+os.mkdir(dir_name)
+os.chdir(dire_name)
+os.getcwd()
+os.rmdir(dir_name)
+</code>
+===== Exceptions Handling =====
+<code python>
+# Standard Exceptions
+Exception # Base class for all exceptions
+StopIteration # Raised when the next() method of an iterator does not point to any object.
+SystemExit # Raised by the sys.exit() function.
+StandardError # Base class for all built-in exceptions except StopIteration and SystemExit.
+ArithmeticError # Base class for all errors that occur for numeric calculation.
+OverflowError # Raised when a calculation exceeds maximum limit for a numeric type.
+FloatingPointError # Raised when a floating point calculation fails.
+ZeroDivisonError # Raised when division or modulo by zero takes place for all numeric types.
+AssertionError # Raised in case of failure of the Assert statement.
+AttributeError # Raised in case of failure of attribute reference or assignment.
+EOFError # Raised when there is no input from either the raw_input() or input() function and
+         # the end of file is reached.
+ImportError # Raised when an import statement fails.
+KeyboardInterrupt # Raised when the user interrupts program execution, usually by pressing Ctrl+c.
+LookupError # Base class for all lookup errors.
+IndexError # Raised when an index is not found in a sequence.
+KeyError # Raised when the specified key is not found in the dictionary.
+NameError # Raised when an identifier is not found in the local or global namespace.
+UnboundLocalError # Raised when trying to access a local variable in a function or method
+                  # but no value has been assigned to it.
+EnvironmentError # Base class for all exceptions that occur outside the Python environment.
+IOError # Raised when an input/ output operation fails, such as the print statement or the
+        # open() function when trying to open a file that does not exist.
+OSError # Raised for operating system-related errors.
+SyntaxError # Raised when there is an error in Python syntax.
+IndentationError # Raised when indentation is not specified properly.
+SystemError # Raised when the interpreter finds an internal problem, but when this error
+            # is encountered the Python interpreter does not exit.
+SystemExit # Raised when Python interpreter is quit by using the sys.exit() function.
+           # If not handled in the code, causes the interpreter to exit.
+TypeError # Raised when an operation or function is attempted that is invalid for the specified data type.
+ValueError # Raised when the built-in function for a data type has the valid type of arguments,
+           # but the arguments have invalid values specified.
+RuntimeError # Raised when a generated error does not fall into any category.
+NotImplementedError # Raised when an abstract method that needs to be implemented in an
+                    # inherited class is not actually implemented.
+</code>
+<code python>
+# assert Statement
+assert Expression[, Arguments]
+assert (Temperature >= 0), "Colder than absolute zero!"
+# Handling an exception
+try:
+   fh = open("testfile", "w")
+   fh.write("This is my test file for exception handling!!")
+except IOError:
+   print ("Error: can\'t find file or read data")
+except AssertionError, SystemExit:
+   print ("Error: multiple exceptions")
+except ValueError as Argument:
+   print ("The argument does not contain numbers\n", Argument)
+except:
+   print ("Error: all exceptions")
+else:
+   print ("Written content in the file successfully")
+finally:
+   fh.close()
+# Raising an Exception
+raise Exception(level)
+# User-Defined Exceptions
+class Networkerror(RuntimeError):
+   def __init__(self, arg):
+      self.args = arg
+try:
+   raise Networkerror("Bad hostname")
+except Networkerror,e:
+   print e.args
+</code>

C++, Qt, OpenGL, CUDA

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