周末任务 - 列表

s = "a4k3b2"
output = ""
i = 0

while i < len(s):
    first = s[i]  
    second =s[i + 1] 
    if second.isdigit():
        alpha=chr(ord(first)+1)
        output=output+ first+ (int(second)*alpha)
        i+=2

print(output)

s = "a4k3b2"
output = ""
i = 0

while i < len(s):
    first = s[i]  
    second =s[i + 1] 
    if second.isdigit():
        output=output+ first+ (int(second)*first)
        i+=2

print(output)

matrix = [[10,20,30], [40,50,60], [70,80,90]]
output=[]

for i in matrix:
    for j in i:
        output.append(j)
print(output)

matrix = [[10, 20, 30], [40, 50, 60], [70, 80, 90]]

output = [j for i in matrix for j in i]
print(output)

[10, 20, 30, 40, 50, 60, 70, 80, 90]

l = ['abc', 'def', 'ghi', 'jkl']

output = [] 
for i, alpha in enumerate(l):
    if i % 2 != 0:
        output.append(alpha.casefold())
    else:
        output.append(alpha)
print(output)

['ABC', 'def', 'GHI', 'jkl']