图1 图2
f=open ("np.txt","r")#以只读方式打开文件
line=f. readline().strip()#从文件中读取一行,并用strip()函数删除末尾的’\n’
while line: #当line非空
t=""
c=line[0]
if c>="a" and c<="z":
t=
else:
t=c
for cin
if c>="A"and c<="Z":
t+=chr(ord(c)+32)
else:
print(t)
line=f.readline().strip()#读取下一行
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2