From b4a54daa7e93292b0de15dc6544ae231aea1d0bd Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Jure=20=C5=A0orn?= Date: Fri, 19 Feb 2021 21:10:48 +0100 Subject: [PATCH] List, String, Numbers, Curses, Scraping --- README.md | 41 +++++++++++++++++++++-------------------- index.html | 41 +++++++++++++++++++++-------------------- 2 files changed, 42 insertions(+), 40 deletions(-) diff --git a/README.md b/README.md index b9051fc..5f95d09 100644 --- a/README.md +++ b/README.md @@ -57,10 +57,10 @@ list_of_chars = list() ```python = .count() # Returns number of occurrences. Also works on strings. -index = .index() # Returns index of first occurrence or raises ValueError. -.insert(index, ) # Inserts item at index and moves the rest to the right. - = .pop([index]) # Removes and returns item at index or from the end. -.remove() # Removes first occurrence of item or raises ValueError. + = .index() # Returns index of the first occurrence or raises ValueError. +.insert(, ) # Inserts item at index and moves the rest to the right. + = .pop([]) # Removes and returns item at index or from the end. +.remove() # Removes first occurrence of the item or raises ValueError. .clear() # Removes all items. Also works on dictionary and set. ``` @@ -309,14 +309,14 @@ String = .split() # Splits on one or more whitespace characters. = .split(sep=None, maxsplit=-1) # Splits on 'sep' str at most 'maxsplit' times. = .splitlines(keepends=False) # Splits on \n,\r,\r\n. Keeps them if 'keepends'. - = .join() # Joins elements using string as separator. + = .join() # Joins elements using string as a separator. ``` ```python = in # Checks if string contains a substring. = .startswith() # Pass tuple of strings for multiple options. = .endswith() # Pass tuple of strings for multiple options. - = .find() # Returns start index of first match or -1. + = .find() # Returns start index of the first match or -1. = .index() # Same but raises ValueError if missing. ``` @@ -512,10 +512,10 @@ from statistics import mean, median, variance, stdev, pvariance, pstdev ### Random ```python from random import random, randint, choice, shuffle, gauss, seed + = random() = randint(from_inclusive, to_inclusive) = choice() -shuffle() ``` ### Bin, Hex @@ -2381,8 +2381,8 @@ def main(screen): while ch != ascii.ESC: height, _ = screen.getmaxyx() screen.clear() - for y, path_ in enumerate(paths[first : first+height]): - screen.addstr(y, 0, path_, A_REVERSE * (selected == first + y)) + for y, a_path in enumerate(paths[first : first+height]): + screen.addstr(y, 0, a_path, A_REVERSE * (selected == first + y)) ch = screen.getch() selected += (ch == KEY_DOWN) - (ch == KEY_UP) selected = max(0, min(len(paths)-1, selected)) @@ -2448,18 +2448,19 @@ Scraping ```python # $ pip3 install requests beautifulsoup4 import requests, bs4, sys -URL = 'https://en.wikipedia.org/wiki/Python_(programming_language)' + +WIKI_URL = 'https://en.wikipedia.org/wiki/Python_(programming_language)' try: - html = requests.get(URL).text - doc = bs4.BeautifulSoup(html, 'html.parser') - table = doc.find('table', class_='infobox vevent') - link = table.find('th', text='Website').next_sibling.a['href'] - ver = table.find('th', text='Stable release').next_sibling.strings.__next__() - url_i = table.find('img')['src'] - image = requests.get(f'https:{url_i}').content + html = requests.get(WIKI_URL).text + document = bs4.BeautifulSoup(html, 'html.parser') + table = document.find('table', class_='infobox vevent') + python_url = table.find('th', text='Website').next_sibling.a['href'] + version = table.find('th', text='Stable release').next_sibling.strings.__next__() + logo_url = table.find('img')['src'] + logo = requests.get(f'https:{logo_url}').content with open('test.png', 'wb') as file: - file.write(image) - print(link, ver) + file.write(logo) + print(python_url, version) except requests.exceptions.ConnectionError: print("You've got problems with connection.", file=sys.stderr) ``` @@ -2614,7 +2615,7 @@ indexes = .argmin(axis) ``` * **Shape is a tuple of dimension sizes.** -* **Axis is the index of a dimension that gets collapsed. The leftmost dimension has index 0.** +* **Axis is an index of the dimension that gets collapsed. Leftmost dimension has index 0.** ### Indexing ```bash diff --git a/index.html b/index.html index 482154d..5075936 100644 --- a/index.html +++ b/index.html @@ -276,10 +276,10 @@ list_of_chars = list(<str>)
  • Module operator provides functions itemgetter() and mul() that offer the same functionality as lambda expressions above.
    • <int> = <list>.count(<el>)     # Returns number of occurrences. Also works on strings.
-index = <list>.index(<el>)     # Returns index of first occurrence or raises ValueError.
-<list>.insert(index, <el>)     # Inserts item at index and moves the rest to the right.
-<el> = <list>.pop([index])     # Removes and returns item at index or from the end.
-<list>.remove(<el>)            # Removes first occurrence of item or raises ValueError.
+<int> = <list>.index(<el>)     # Returns index of the first occurrence or raises ValueError.
+<list>.insert(<int>, <el>)     # Inserts item at index and moves the rest to the right.
+<el> = <list>.pop([<int>])     # Removes and returns item at index or from the end.
+<list>.remove(<el>)            # Removes first occurrence of the item or raises ValueError.
 <list>.clear()                 # Removes all items. Also works on dictionary and set.

    #Dictionary

    <view> = <dict>.keys()                          # Coll. of keys that reflects changes.
@@ -450,12 +450,12 @@ to_exclusive   = <range>.stop
 
    <list> = <str>.split()                       # Splits on one or more whitespace characters.
 <list> = <str>.split(sep=None, maxsplit=-1)  # Splits on 'sep' str at most 'maxsplit' times.
 <list> = <str>.splitlines(keepends=False)    # Splits on \n,\r,\r\n. Keeps them if 'keepends'.
-<str>  = <str>.join(<coll_of_strings>)       # Joins elements using string as separator.
+<str>  = <str>.join(<coll_of_strings>)       # Joins elements using string as a separator.
 
    
 
    <bool> = <sub_str> in <str>                  # Checks if string contains a substring.
 <bool> = <str>.startswith(<sub_str>)         # Pass tuple of strings for multiple options.
 <bool> = <str>.endswith(<sub_str>)           # Pass tuple of strings for multiple options.
-<int>  = <str>.find(<sub_str>)               # Returns start index of first match or -1.
+<int>  = <str>.find(<sub_str>)               # Returns start index of the first match or -1.
 <int>  = <str>.index(<sub_str>)              # Same but raises ValueError if missing.
 
    
 
    <str>  = <str>.replace(old, new [, count])   # Replaces 'old' with 'new' at most 'count' times.
@@ -614,10 +614,10 @@ to_exclusive   = <range>.stop

    Random

    from random import random, randint, choice, shuffle, gauss, seed
+
 <float> = random()
 <int>   = randint(from_inclusive, to_inclusive)
 <el>    = choice(<list>)
-shuffle(<list>)

    Bin, Hex

    <int> = ±0b<bin>                         # Or: ±0x<hex>
@@ -2087,8 +2087,8 @@ plt.clf()                                      # Clea
     while ch != ascii.ESC:
         height, _ = screen.getmaxyx()
         screen.clear()
-        for y, path_ in enumerate(paths[first : first+height]):
-            screen.addstr(y, 0, path_, A_REVERSE * (selected == first + y))
+        for y, a_path in enumerate(paths[first : first+height]):
+            screen.addstr(y, 0, a_path, A_REVERSE * (selected == first + y))
         ch = screen.getch()
         selected += (ch == KEY_DOWN) - (ch == KEY_UP)
         selected = max(0, min(len(paths)-1, selected))
@@ -2143,18 +2143,19 @@ logger.<level>('A logging message.')
 
 
    #Scraping
    Scrapes Python's URL, version number and logo from its Wikipedia page:
    # $ pip3 install requests beautifulsoup4
 import requests, bs4, sys
-URL = 'https://en.wikipedia.org/wiki/Python_(programming_language)'
+
+WIKI_URL = 'https://en.wikipedia.org/wiki/Python_(programming_language)'
 try:
-    html  = requests.get(URL).text
-    doc   = bs4.BeautifulSoup(html, 'html.parser')
-    table = doc.find('table', class_='infobox vevent')
-    link  = table.find('th', text='Website').next_sibling.a['href']
-    ver   = table.find('th', text='Stable release').next_sibling.strings.__next__()
-    url_i = table.find('img')['src']
-    image = requests.get(f'https:{url_i}').content
+    html       = requests.get(WIKI_URL).text
+    document   = bs4.BeautifulSoup(html, 'html.parser')
+    table      = document.find('table', class_='infobox vevent')
+    python_url = table.find('th', text='Website').next_sibling.a['href']
+    version    = table.find('th', text='Stable release').next_sibling.strings.__next__()
+    logo_url   = table.find('img')['src']
+    logo       = requests.get(f'https:{logo_url}').content
     with open('test.png', 'wb') as file:
-        file.write(image)
-    print(link, ver)
+        file.write(logo)
+    print(python_url, version)
 except requests.exceptions.ConnectionError:
     print("You've got problems with connection.", file=sys.stderr)
 
    
@@ -2270,7 +2271,7 @@ indexes = <array>.argmin(axis)
    • Shape is a tuple of dimension sizes.
      • -
    • Axis is the index of a dimension that gets collapsed. The leftmost dimension has index 0.
      • +
    • Axis is an index of the dimension that gets collapsed. Leftmost dimension has index 0.

    Indexing

    <el>       = <2d_array>[0, 0]        # First element.
 <1d_view>  = <2d_array>[0]           # First row.