class Man:
def __init__(self,
name="unknown",
country="unknown"):
self.name = name
self.country = country
man1 = Man()
# man1.name is 'unknown'
# man1.country is 'unknown'
man2 = Man("Vladimir")
# man2.name is 'Vladimir'
# man2.country is 'unknown'
man3 = Man(country="Brazil")
# man3.name is 'unknown'
# man3.country is 'Brazil'
man4 = Man("Vladimir", "Brazil")
# man4.name is 'Vladimir'
# man4.country is 'Brazil'
print(f"{man1.name = }, {man1.country = }")
print(f"{man2.name = }, {man2.country = }")
print(f"{man3.name = }, {man3.country = }")
print(f"{man4.name = }, {man4.country = }")