set
in the
Python Standard Library
Note that the following
set
function does not give us any error message
when we try to insert two copies of
"Grover Cleveland"
into the set.
"""
Remove extra copies, if any, from a list.
"""
import sys
listOfPresidents = [
None, #Make George Washington #1.
"George Washington", # 1
"John Adams", # 2
"Thomas Jefferson", # 3
"James Madison", # 4
"James Monroe", # 5
"John Quincy Adams", # 6
"Andrew Jackson", # 7
"Martin Van Buren", # 8
"William Henry Harrison", # 9
"John Tyler", #10
"James K. Polk", #11
"Zachary Taylor", #12
"Millard Fillmore", #13
"Franklin Pierce", #14
"James Buchanan", #15
"Abraham Lincoln", #16
"Andrew Johnson", #17
"Ulysses S. Grant", #18
"Rutherford B. Hayes", #19
"James A. Garfield", #20
"Chester A. Arthur", #21
"Grover Cleveland", #22 (non-consecutive)
"Benjamin Harrison", #23
"Grover Cleveland", #24 (non-consecutive)
"William McKinley", #25
"Theodore Roosevelt", #26
"William Howard Taft", #27
"Woodrow Wilson", #28
"Warren G. Harding", #29
"Calvin Coolidge", #30
"Herbert Hoover", #31
"Franklin D. Roosevelt", #32
"Harry S. Truman", #33
"Dwight D. Eisenhower", #34
"John F. Kennedy", #35
"Lyndon B. Johnson", #36
"Richard Nixon", #37
"Gerald Ford", #38
"Jimmy Carter", #39
"Ronald Reagan", #40
"George H. W. Bush", #41
"Bill Clinton", #42
"George W. Bush", #43
"Barack Obama", #44
"Donald Trump" #45
]
setOfPresidents = set(listOfPresidents[1:])
for i, president in enumerate(setOfPresidents, start = 1):
print(f"{i:2} {president}")
sys.exit(0)
1 John Tyler
2 Franklin Pierce
3 William McKinley
4 Theodore Roosevelt
5 John Quincy Adams
6 Calvin Coolidge
7 Grover Cleveland
8 Herbert Hoover
9 John Adams
10 William Henry Harrison
11 James Monroe
12 Chester A. Arthur
13 Millard Fillmore
14 Gerald Ford
15 Zachary Taylor
16 James Buchanan
17 Martin Van Buren
18 Dwight D. Eisenhower
19 Abraham Lincoln
20 Bill Clinton
21 John F. Kennedy
22 Woodrow Wilson
23 George Washington
24 Ronald Reagan
25 Harry S. Truman
26 James A. Garfield
27 Jimmy Carter
28 George H. W. Bush
29 William Howard Taft
30 Donald Trump
31 Lyndon B. Johnson
32 Warren G. Harding
33 Barack Obama
34 Richard Nixon
35 Andrew Johnson
36 Franklin D. Roosevelt
37 James Madison
38 James K. Polk
39 Andrew Jackson
40 George W. Bush
41 Ulysses S. Grant
42 Thomas Jefferson
43 Rutherford B. Hayes
44 Benjamin Harrison
dictionary (in Python version ≥ 3.7)
or a
collections.OrderedDict.
dictOfPresidents = {president: None for president in listOfPresidents[1:]}
for i, president in enumerate(dictOfPresidents, start = 1):
print(f"{i:2} {president}")
1 George Washington
2 John Adams
3 Thomas Jefferson
4 James Madison
5 James Monroe
6 John Quincy Adams
7 Andrew Jackson
8 Martin Van Buren
9 William Henry Harrison
10 John Tyler
11 James K. Polk
12 Zachary Taylor
13 Millard Fillmore
14 Franklin Pierce
15 James Buchanan
16 Abraham Lincoln
17 Andrew Johnson
18 Ulysses S. Grant
19 Rutherford B. Hayes
20 James A. Garfield
21 Chester A. Arthur
22 Grover Cleveland
23 Benjamin Harrison
24 William McKinley
25 Theodore Roosevelt
26 William Howard Taft
27 Woodrow Wilson
28 Warren G. Harding
29 Calvin Coolidge
30 Herbert Hoover
31 Franklin D. Roosevelt
32 Harry S. Truman
33 Dwight D. Eisenhower
34 John F. Kennedy
35 Lyndon B. Johnson
36 Richard Nixon
37 Gerald Ford
38 Jimmy Carter
39 Ronald Reagan
40 George H. W. Bush
41 Bill Clinton
42 George W. Bush
43 Barack Obama
44 Donald Trump
""" Remove extra copies, if any, from a list. """ import sys import pandas as pd import numpy as np listOfPresidents = [ None, "George Washington", # 1 "John Adams", # 2 "Thomas Jefferson", # 3 "James Madison", # 4 "James Monroe", # 5 "John Quincy Adams", # 6 "Andrew Jackson", # 7 "Martin Van Buren", # 8 "William Henry Harrison", # 9 "John Tyler", #10 "James K. Polk", #11 "Zachary Taylor", #12 "Millard Fillmore", #13 "Franklin Pierce", #14 "James Buchanan", #15 "Abraham Lincoln", #16 "Andrew Johnson", #17 "Ulysses S. Grant", #18 "Rutherford B. Hayes", #19 "James A. Garfield", #20 "Chester A. Arthur", #21 "Grover Cleveland", #22 (non-consecutive) "Benjamin Harrison", #23 "Grover Cleveland", #24 (non-consecutive) "William McKinley", #25 "Theodore Roosevelt", #26 "William Howard Taft", #27 "Woodrow Wilson", #28 "Warren G. Harding", #29 "Calvin Coolidge", #30 "Herbert Hoover", #31 "Franklin D. Roosevelt", #32 "Harry S. Truman", #33 "Dwight D. Eisenhower", #34 "John F. Kennedy", #35 "Lyndon B. Johnson", #36 "Richard Nixon", #37 "Gerald Ford", #38 "Jimmy Carter", #39 "Ronald Reagan", #40 "George H. W. Bush", #41 "Bill Clinton", #42 "George W. Bush", #43 "Barack Obama", #44 "Donald Trump" #45 ] series = pd.Series(listOfPresidents[1:]) #series is a pandas Series series.drop_duplicates(inplace = True) series.index = np.arange(1, series.size + 1) #or series.index = range(1, len(series) + 1) s = series.to_string(index = True, length = True) print(s) sys.exit(0)
1 George Washington
2 John Adams
3 Thomas Jefferson
4 James Madison
5 James Monroe
6 John Quincy Adams
7 Andrew Jackson
8 Martin Van Buren
9 William Henry Harrison
10 John Tyler
11 James K. Polk
12 Zachary Taylor
13 Millard Fillmore
14 Franklin Pierce
15 James Buchanan
16 Abraham Lincoln
17 Andrew Johnson
18 Ulysses S. Grant
19 Rutherford B. Hayes
20 James A. Garfield
21 Chester A. Arthur
22 Grover Cleveland
23 Benjamin Harrison
24 William McKinley
25 Theodore Roosevelt
26 William Howard Taft
27 Woodrow Wilson
28 Warren G. Harding
29 Calvin Coolidge
30 Herbert Hoover
31 Franklin D. Roosevelt
32 Harry S. Truman
33 Dwight D. Eisenhower
34 John F. Kennedy
35 Lyndon B. Johnson
36 Richard Nixon
37 Gerald Ford
38 Jimmy Carter
39 Ronald Reagan
40 George H. W. Bush
41 Bill Clinton
42 George W. Bush
43 Barack Obama
44 Donald Trump
Length: 44
To left justify the numbers and right justify the strings,
for i, name in series.items(): #series is a pandas Series print(f"{i:2} {name}")
1 George Washington 2 John Adams 3 Thomas Jefferson 4 James Madison 5 James Monroe 6 John Quincy Adams 7 Andrew Jackson 8 Martin Van Buren 9 William Henry Harrison 10 John Tyler etc.