wk0.1 A curious case of conditionals

Intro to git and github

Feedback form: https://docs.google.com/forms/d/1A0rjsJUUBlQTXOpHN0wGglDEG4Mte5DorovPTS_cbsI/viewform?usp=send_form

Read these:

A few challenges

Complete reverse_string and primes challenges in challenge folder.

Reviewing some ideas from yesterday

# Example from yesterday def t(num): if 10 <= num < 15: print("hot") elif num > 15: print("hotter") else: print("cold") # What does this function do? for i in range(4): for j in range(10): if j % 3 == 0: continue if j > 7 and j % 2 == 0: break else: print('i equals', i) print('j equals', j) print('------------')

While Conditional.: return discussion

Follow up on yesterday's discussion on conditionals

more on conditionals:

is and is not
- difference between is and ==

Try evaluating each of the lines below in your python REPL. What's going on?

a = [1, 2, 3]
b = a
b is a
b == a
b = a[:]
b is a
b == a

If you have a hypothesis about the difference between is and ==, devise some tests you could try out to disprove your hypothesis. Implement them. Were you correct?

in and not in
and, or
comparison priority

not has the highest priority and or the lowest, so that A and not B or C is equivalent to (A and (not B)) or C.
Short circuit operators

More string and list practice

Add elements from a list L to the end of another list at least three different ways.
Insert elements into a list at least two different ways.
Insert an element into a string (this might take more than one step...).
Remove an item from a list by value.
Remove an item from a list by index.
Remove all items from a list two different ways.
Return the index in the list of the first item whose value is x.
Return the number of times x appears in the list.
Capitalize the first element in a string
Capitalize all elements in a string
Strip leading, trailing, and all whitespace (ex. leading: ' asdf ' --> 'asdf ', trailing:' asdf ' --> ' asdf', all:' asdf ' --> 'asdf').
Split a sentence into a list of words (no whitespace), how would you split on comma or semi-colon?
Read up on how to format strings

Intro to pins assignment

Intro to try/except and error handling
- Syntax errors vs. exceptions



In [ ]:

    
10 * (1/0)



In [ ]:

    
4 + spam*3



In [ ]:

    
'2' + 2

Handing exceptions



In [ ]:

    
while True:
    try:
        x = int(input("Please enter a number: "))
        break
    except ValueError:
        print("Oops!  That was no valid number.  Try again...")