Python求指点，初学者不太懂

x[::3]
x[::2].replace('e','')

x = " abcdefg"
s1 =x[0] + x[1::3] # 注意空格
s2 = x[:2] + x[3::4]
print("s1={}".format(s1))
print("s2={}".format(s2))

结果:

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