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Learn Python from Scratch
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Kursinhalt

Learn Python from Scratch

Learn Python from Scratch

1. The basics
Hello, World!Hello, me!VariablesCommentsIndentationNumbers and strings
2. Arithmetic operations
AdditionMultiplication and powerDivision and whole part division
3. Common data types
Data typesNumbersfloat and intStoring textStrings slicingConcatenation
4. Conditional statements
Boolean data typeCombining conditionsSimple if/else expressions (1/2)Simple if/else expressions (2/2)If/else expressions with multiple conditions (1/2)If/else expressions with multiple conditions (2/2)
5. Other data types
Lists (1/3)Lists (2/3)Lists (3/3)Tuples (1/3)Tuples (2/3)Tuples (3/3)Dictionaries (1/2)Dictionaries (2/2)
6. Loops
while loop (1/2)while loop (2/2)for loop (1/5)for loop (2/5)for loop (3/5)for loop (4/5)for loop (5/5)
7. Functions
Built-in functionsWriting your own functions (1/5)Writing your own functions (2/5)Writing your own functions (3/5)Writing your own functions (4/5)Writing your own functions (5/5)lambda functions

book
Dictionaries (2/2)

Let's consider some useful methods for dictionaries:

  • len(d) - returns length of dictionary d (number of pairs key:value);
  • min(d), max(d) - minimum or maximum of keys of dictionary d;
  • d.copy() - returns copy of dictionary d;
  • d.items() - returns all pairs (key, value) in dictionary d;
  • d.keys() - returns all keys of dictionary d;
  • d.values() - returns all values of dictionary d;
  • d[k] = e - set value e to key k.

For example, traditionally, let's update our dictionary so it will contain two more countries:

CountryAreaPopulation
Brazil8515767212559417
India31663911380004385

              
123456

            
# old dictionary
countries_dict = {'USA': (9629091, 331002651), 'Canada': (9984670, 37742154), 'Germany': (357114, 83783942)}
# update dictionary with countries
countries_dict["Brazil"] = (8515767, 212559417)
countries_dict["India"] = (3166391, 1380004385)
print(countries_dict)
copy
Aufgabe

Swipe to start coding

Update your dictionary with people so it will contain information for the next two people and then print the whole dictionary:

NameAgeHeight
John41185
Michelle35165

Lösung

Switch to desktopWechseln Sie zum Desktop, um in der realen Welt zu übenFahren Sie dort fort, wo Sie sind, indem Sie eine der folgenden Optionen verwenden
War alles klar?

Wie können wir es verbessern?

Danke für Ihr Feedback!

Abschnitt 5. Kapitel 8
toggle bottom row

book
Dictionaries (2/2)

Let's consider some useful methods for dictionaries:

  • len(d) - returns length of dictionary d (number of pairs key:value);
  • min(d), max(d) - minimum or maximum of keys of dictionary d;
  • d.copy() - returns copy of dictionary d;
  • d.items() - returns all pairs (key, value) in dictionary d;
  • d.keys() - returns all keys of dictionary d;
  • d.values() - returns all values of dictionary d;
  • d[k] = e - set value e to key k.

For example, traditionally, let's update our dictionary so it will contain two more countries:

CountryAreaPopulation
Brazil8515767212559417
India31663911380004385

              
123456

            
# old dictionary
countries_dict = {'USA': (9629091, 331002651), 'Canada': (9984670, 37742154), 'Germany': (357114, 83783942)}
# update dictionary with countries
countries_dict["Brazil"] = (8515767, 212559417)
countries_dict["India"] = (3166391, 1380004385)
print(countries_dict)
copy
Aufgabe

Swipe to start coding

Update your dictionary with people so it will contain information for the next two people and then print the whole dictionary:

NameAgeHeight
John41185
Michelle35165

Lösung

Switch to desktopWechseln Sie zum Desktop, um in der realen Welt zu übenFahren Sie dort fort, wo Sie sind, indem Sie eine der folgenden Optionen verwenden
War alles klar?

Wie können wir es verbessern?

Danke für Ihr Feedback!

Abschnitt 5. Kapitel 8
Switch to desktopWechseln Sie zum Desktop, um in der realen Welt zu übenFahren Sie dort fort, wo Sie sind, indem Sie eine der folgenden Optionen verwenden
Wir sind enttäuscht, dass etwas schief gelaufen ist. Was ist passiert?
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