new examples 2019.10.13

Author: furas

__scraping__/vanglaini.org - requests - BS/main.py

@@ -0,0 +1,25 @@
+#!/usr/bin/env python3
+
+# date: 2019.10.12
+
+import requests
+from bs4 import BeautifulSoup 
+import pandas as pd
+
+response = requests.get('https://www.vanglaini.org/')
+soup = BeautifulSoup(response.text, 'lxml')
+
+data = []
+
+for article in soup.find_all('article'):
+    if article.a is None:
+        continue
+    row = [
+        article.a.text.strip(), # headline
+        article.p.text.strip(), # summary
+        "https://www.vanglaini.org" + article.a['href'] # link
+    ]
+    data.append(row)
+    
+df = pd.DataFrame(data, columns=['Headline', 'Summary', 'Link'])
+print(df)

string/join-to-string/main.py

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+def to_string(my_list, sep=', '):
+
+    string = ''
+
+    for char in my_list:
+        if string:
+            string = string + sep
+        string = string + char
+
+    return string
+
+my_list = ['H','E','L','p']
+print(to_string(my_list, '-'))
+print(to_string(['a'], '-'))
+print(to_string([], '-'))
+
+def to_string(my_list, sep=', '):
+
+    if not my_list:
+        return ''
+
+    string = my_list[0]
+
+    for char in my_list[1:]:
+        string = string + sep + char
+
+    return string
+
+my_list = ['H','E','L','p']
+print(to_string(my_list, '-'))
+print(to_string(['a'], '-'))
+print(to_string([], '-'))

tkinter/pages/other-example/main.py

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+#!/usr/bin/env python3
+
+# date: 2019.10.12
+
+import tkinter as tk
+
+class Main(tk.Tk):
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        
+        self.shared_data ={
+            "email": tk.StringVar(),
+            "password": tk.StringVar()
+        }
+        
+        self.frames = {
+            'StartPage': StartPage(self, self),
+            'PageTwo': PageTwo(self, self),
+        }
+        
+        self.current_frame = None
+        self.show_frame('StartPage')
+
+    def show_frame(self, name):
+        if self.current_frame:
+            self.current_frame.forget()
+        self.current_frame = self.frames[name]
+        self.current_frame.update_widgets()
+        self.current_frame.pack()
+                            
+class BasePage(tk.Frame):
+    def __init__(self, parent, controller):
+        super().__init__(parent)
+        self.controller = controller
+        self.create_widgets()
+        
+    def create_widgets(self):
+        pass
+    
+    def update_widgets(self):
+        pass
+                            
+class StartPage(BasePage):
+
+    def create_widgets(self):
+        self.entry1 = tk.Entry(self, textvariable=self.controller.shared_data["email"])
+        self.entry1.pack()
+        self.entry2 = tk.Entry(self, show='*')
+        self.entry2.pack()
+        button = tk.Button(self, text="Submit", command=lambda:self.controller.show_frame("PageTwo"))
+        button.pack()
+    
+class PageTwo(BasePage):
+
+    def create_widgets(self):
+        self.label = tk.Label(self, text="")
+        self.label.pack()
+
+        button = tk.Button(self, text="Back", command=lambda:self.controller.show_frame("StartPage"))
+        button.pack()
+
+    def update_widgets(self):
+        self.label["text"] = "Welcome, {}".format(self.controller.shared_data["email"].get())
+        
+        
+if __name__ == "__main__":
+    win = Main()
+    win.mainloop()

tkinter/treeview/rename-double-click/main.py

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+
+# date: 2019.10.13
+# https://stackoverflow.com/questions/58358089/how-to-create-ui-that-shows-a-hierarchy
+
+import tkinter as tk
+from tkinter import ttk
+
+# --- functions ---
+ 
+def rename(event=None): # `event` to get argument from double click
+    top = tk.Toplevel()
+    name_entry = tk.Entry(top)
+    name_entry.pack()
+
+    def on_enter(event):
+        selected = tree.selection()[0]
+        print(selected)
+        print(tree.item(selected)['text'], name_entry.get())
+        #tree.item(selected)['text'] = name_entry.get()
+        tree.item(selected, text=name_entry.get())
+        print(tree.item(selected)['text'], name_entry.get())
+        top.destroy()
+
+    name_entry.bind('<Return>', on_enter)
+ 
+def add():
+    top = tk.Toplevel()
+    tk.Label(top, text="Name").pack()
+    name_entry = tk.Entry(top)
+    name_entry.pack()
+
+    def on_OK():
+        item = tree.insert(tree.selection(), "end", text=name_entry.get())
+        tree.item(item, tag=item) # add tag to bind mouse click
+        tree.tag_bind(item, '<Double-Button-1>', rename) # rename on double click
+        top.destroy()
+
+    tk.Button(top, text="OK", command=on_OK).pack(fill='x')
+    tk.Button(top, text="Cancel", command=quit).pack(fill='x')
+ 
+def delete():
+    if tree.selection():
+        tree.delete(tree.selection())
+ 
+# --- main ---
+
+my_app = tk.Tk()
+
+tk.Button(my_app,text="add", command=add).pack(fill='x')
+tk.Button(my_app,text="delete", command=delete).pack(fill='x')
+tk.Button(my_app,text="rename", command=rename).pack(fill='x')
+  
+tree = ttk.Treeview(my_app)
+tree.column("#0", width=270, minwidth=270)
+tree.pack(side='top', fill='x')
+ 
+my_app.mainloop()