python-flow-control

CH 1. Flow Control Overview & Boolean & Comparison Operator

Flow Control : Conditional & Loop

Boolean: True or False

Comparison Operators: ==, >, <, >=, <=, !=

• '=' is an assignment operator

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Ch 2. Conditional Statement

1-1. if basics

• if the statement after if is false, it does not print anything

1-2. if practice problem

• Create a variable called input_id, receive input as input, and print a specific phrase if it matches the value stored in the variable called id.

2-1. if else

• If the conditional statement is False, print the value after else:.

2-2. else practice problem

• If you receive a value other than egoing stored in the id variable as input_id, print Who?

3-1. elif

• If the if statement is false, it goes over to the elif statement.
• If eliff statement is also false, print the value after else:.

3-2. elif practice problem

• Make two id variables, and if the value entered in input_id matches at least one, print Welcome, if it does not match both variables, print Who?

4-0. if in the if

• Using the if in the if, the id in the first if and the password in the second if must match to print Welcome.

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Ch 3. Loop

• Loop and lists go together

1. For statement

    for (value) in [1,2,3]

print (value) # print 1,2,3 in order

2. Multi-dimensional lists

One-dimensional list

['egoing','basta',blackdew'] 

Two-dimensional list

[['egoing','Seoul','Web'],['basta','Seoul','IOT'],['blackdew','Tongyeong','ML']]

• putting variable names directly after "for" makes code interpretation better

   for name, address, interest in names:
  

3. dictionary

    {'name':'egoing', 'address':'Seoul', 'interest':'Web'}

Dictionary that matches key and value

*for key in person:
print(key) will print dictionary's key,
person[key] will print key's value in the dictionary