pythonic

int('123', base = 2)
kw = {'base': 2}
int('123', **kw)

def ():
    ...
def func2():
    ...
dicts = {
    'A': func1,
    'B': func2,
    ...
};
func = dicts[value]
func();

L = [i * i for i range(5)]
for index, data in enumberate(L, 1):    
    print(index, data)

with open('somefile', 'xt') as f:
    f.write('Hellon')

# GOOD
if a>b>c:
    pass
# BAD
if a>b and b>c:
    pass

# 输入一个数字，不够八位前面补0
num = input("please enter a number")
lack = 8-len(num)
out = '0'*lack+num