rw

.vscode/settings.json

@@ -1,3 +1,20 @@
 {
-	"python.formatting.provider": "black"
+	"python.formatting.provider": "black",
+	"workbench.colorCustomizations": {
+		"activityBar.activeBackground": "#920320",
+		"activityBar.activeBorder": "#000000",
+		"activityBar.background": "#920320",
+		"activityBar.foreground": "#e7e7e7",
+		"activityBar.inactiveForeground": "#e7e7e799",
+		"activityBarBadge.background": "#000000",
+		"activityBarBadge.foreground": "#e7e7e7",
+		"statusBar.background": "#600215",
+		"statusBar.foreground": "#e7e7e7",
+		"statusBarItem.hoverBackground": "#920320",
+		"titleBar.activeBackground": "#600215",
+		"titleBar.activeForeground": "#e7e7e7",
+		"titleBar.inactiveBackground": "#60021599",
+		"titleBar.inactiveForeground": "#e7e7e799"
+	},
+	"peacock.color": "#600215"
 }

ascii_error.txt

@@ -0,0 +1 @@
+é is not ascii

c5_01_03_rw_text_print.py

@@ -0,0 +1,77 @@
+#%%
+"""
+read file
+write to file
+redirect print
+encoding
+change print separator
+"""
+#%%[markdown] 
+# # Read an write text data
+# %% 
+# * Read the entire file as a single string
+with open("lorem.txt", "rt") as f:
+	data = f.read()
+# %%
+data
+# %%
+# * Iterate over the lines of a file
+with open("lorem.txt","rt") as f:
+	for line in f:
+		print(line)
+
+# %%
+# * write chunks of text data
+with open("ipsum.txt", "wt") as f:
+	f.write("Donec placerat sit amet arcu nec consectetur.\n")
+	f.write("Mauris quis nisi vel ipsum mattis lacinia ac ut leo.\n")
+	f.write("Maecenas volutpat fringilla sapien in euismod.\n")
+# %%
+# * or redirect a print statement
+with open("ipsum.txt", "wt") as f:
+	print("Etiam eget posuere lacus, sit amet imperdiet odio.", file=f)
+# %%
+# fails if file is opened in byte mode
+with open("ipsum.txt", "wb") as f:
+	print("Etiam eget posuere lacus, sit amet imperdiet odio.", file=f)
+# %%
+# * append at the end of file
+with open("ipsum.txt", "at") as f:
+	print("append1", file=f)
+	f.write("append2")
+# %%
+#* encoding
+# %%
+import sys
+sys.getdefaultencoding()
+# %%
+"""Python understands hundreds of text encodings : most common are ascii, latin-1, utf-8 and utf-16. 
+utf 8 is usually a safe bet if working with web app
+ascii : 7 bit characters in the range U+0000 to U+007F
+latin-1 : direct mapping of bytes 0-255 to unicode character U+0000 to U+00FF
+latin-1 encoding will never produce a decoding error when reading text of a possibly unknown encoding. Reading a file as latin-1 might not product a completely correct text decoding though but if you later write the data back out, the original input data will be preserved"""
+# %%
+
+with open("lorem.txt", "rt", encoding="latin-1") as f:
+	print(f.read())
+
+# %%
+# * newline
+"""
+recognition on newline on Unix : \n
+on windows : \r\n
+By default python operates on a "universal newline" mode : all common newlines conventions are recognized and transformed into a single newline character (by default \n on unix and \r\n on windows)
+If you dont want this translation supply newline='' to open
+"""
+
+# %%
+with open("ascii_error.txt", "rt", encoding="ascii") as f:
+	data = f.read()
+# %%
+with open("ascii_error.txt", "rt", encoding="ascii", errors="replace") as f:
+	data = f.read()
+data
+# %%
+# %%
+print('first', 'second', 'third', sep="<(-_-)>")
+# %%

c5_04_rw_binary_data.py

@@ -0,0 +1,49 @@
+#%%
+"""
+read and write binary data
+byte integer value (indexing and iterating)
+encode and decode
+no conversion writing
+"""
+#%%
+#* basic read write
+with open("lorem.txt", "rb") as f:
+	data = f.read()
+# %%
+data
+# %%
+with open("ipsum2.txt", "wb") as f:
+	data = f.write(b"Hello world")
+# %%
+# * iterating 
+# text
+t = "Hello world"
+for c in t:
+	print(c)
+# %%
+# byte: indexing and iterating return integer byte values instead of byte strings
+b = b"Hello world"
+for c in b:
+	print(c)
+# %%
+# * encode and decode
+with open("ipsum2.txt", "wb") as f:
+	text = "Hello world"
+	f.write(text.encode("utf-8"))
+
+# %%
+with open("ipsum2.txt", "rb") as f:
+	data = f.read(4)
+	print(data.decode("utf-8"))
+# %%
+#* no conversion
+import array
+nums = array.array("i", [1,2,3,4])
+with open("data.bin", "wb") as f:
+	f.write(nums)
+# %%
+a = array.array('i', [0,0,0,0,0,0,0,0])
+with open("data.bin", "rb") as f:
+	f.readinto(a)
+a
+# %%

c5_05_writing_to_file_if_not_exist.py

@@ -0,0 +1,22 @@
+#%%
+with open("exists.txt", "wt") as f:
+	f.write("BANZAI")
+# %%
+# * Instead of 
+import os
+if not os.path.exists("exists.txt"):
+	with open("exists.txt", "wt") as f:
+		f.write("Hello")
+else:
+	print("Already exists")
+# %%
+# * Use :
+with open("exists.txt", "xt") as f:
+	f.write("Hello")
+# %%
+try:
+	with open("exists.txt", "xt") as f:
+		f.write("Hello")
+except FileExistsError:
+	print("Already exists")
+# %%

c9_09_class_decorators.py

@@ -5,7 +5,7 @@ class decorator : __get__
 """
 
 #%% [markdown]
-# # Class decorators for functions
+# # Class decorators
 #%%
 import types
 from functools import wraps
@@ -131,33 +131,6 @@ def baz():
 """
 # %%
 
-
-
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-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
 # %%
 def profiled2(func):
     ncalls = 0

c9_09_descriptor_property_class_static.py

@@ -10,7 +10,8 @@ class and static methods
 #%% [markdown]
 # # Classic accessor : BAD
 # Note : only do this if you want to add extra funcs to get, set and delete
-#%% [markdown]
+
+#%%
 class Tester:
     def __init__(self, val):
         self.val = val

exists.txt

@@ -0,0 +1 @@
+BANZAI

gg.json

@@ -0,0 +1,6 @@
+{
+    "name": "ff",
+    "cc": {
+        "name": "jon"
+    }
+}

ipsum2.txt

@@ -0,0 +1 @@
+Hello world

lorem.txt

@@ -0,0 +1,10 @@
+Lorem ipsum dolor sit amet, consectetur adipiscing elit.
+Maecenas faucibus, nibh et elementum venenatis, risus lorem consectetur lacus, pulvinar lacinia lacus sem eu felis.
+Sed in ligula dui.
+Phasellus sagittis id nisl nec sollicitudin.
+Phasellus posuere neque ut eros consectetur sagittis.
+Nunc auctor sodales arcu, eget consequat nibh interdum sed.
+Mauris tempor ante vitae nibh convallis, sit amet varius eros consequat.
+Integer id varius neque.
+Nam egestas ac diam vitae dapibus.
+Sed sit amet justo ut nunc hendrerit ultrices quis id mi.

sandbox.py

@@ -0,0 +1,38 @@
+#%%
+from collections import Counter
+
+
+# %%
+{} + {'a':5}
+# %%
+round(55,-2)
+# %%
+0.1.is_integer()
+# %%
+1.1.is_integer()
+# %%
+def manipulate_user_input():
+	prompt = "Enter a number"
+	inp = input(prompt)
+	try:
+		nb = float(inp)
+		rd = round(nb,2)
+		print(f"{nb} rounded to two decimal places is {rd:.2f}")
+	except ValueError:
+		print("A number, dumass")
+
+# %%
+manipulate_user_input()
+# %%
+f"{3**.125:.3f}"
+# %%
+f"{150000:,.2f}"
+
+# %%
+f"{2.02/10:.0%}"
+# %%
+(1+2j).conjugate()
+# %%
+f"{10:#o}"
+
+# %%