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#练习一：自己定义一个reverse(s)函数，功能返回字符串s的倒序字符串。
def reverse():
x = []
s = [9,8,7,6,5,4,3,2,1,0]
for i in range(len(s)-1,-1,-1):
x.append(s[i])
return(x)
y = reverse()
print(y)
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#练习二：写函数，根据给定符号和行数，打印相应直角三角形，等腰三角形及其他形式的三角形。
def pattern(pat):
for i in range(1,len(pat)):
for j in range(1,i+1):
print(pat[0],' ',end = '')
print()
print("-"*30)
for i in range(1,len(pat)-1):
for j in range(len(pat)-1-i,0,-1):
print(' ',end = '')
for k in range(1,2*i):
print(pat[0],end = '')
print()
print("-"*30)
for i in range(1,len(pat)+1):
for j in range(len(pat)-i,0,-1):
print(' ',end = '')
for k in range(1,i+1):
print(pat[0],' ',end = '')
print()
def main():
text = "******"
pattern(text)
if __name__ == '__main__':
main()
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#练习三：将任务4中的英语动词单数变复数的函数，尽可能的考虑多种情况，重新进行实现。
def plur():
sp = input("请输入一个英语动词的单数形式，以回车结束：")
x1 = ['o','x','s','sh','ch']
x2 = ['by','cy','dy','fy','gy','jy','ky','ly','my','my','py','qy','ry','sy','ty','vy','wy','xy','yy','zy']
while sp:
if sp[-1] in x1:
print(sp + 'es')
elif sp[-2:] in x1:
print(sp + 'es')
else:
if sp[-2:] in x2:
print(sp[:-1] + 'es')
else:
print(sp +'s')
sp = input("请输入一个英语动词的单数形式，以回车结束：")
plur()
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#练习四：写函数，根据给定符号，上底、下底、高，打印各种梯形。
symbol = "*"
def shape():
x= int(input("请输入要打印的梯形的s底，以回车结束："))
y= int(input("请输入要打印的梯形的x底，以回车结束："))
z = int(input("请输入要打印的梯形的高，以回车结束："))
for i in range(1,z+1):
for k in range(1,i+x):
print("*",end='')
#for j in range(z-i,0,-1):
print('\n')
shape()
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#练习五：写函数，根据给定符号，打印各种菱形。
def shape():
s = "*"
for i in range(1,8,2):
print((s*i).center(7))
for i in reversed(range(1,6,2)):
print((s*i).center(7))
print()
shape()
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#练习六：与本小节任务基本相同，但要求打印回文字符倒三角形。
def plalindrome(line):
for i in range(len(line)*2,0,-1):
if i == 1:
print(' '*(len(line)*2-1) +line[0])
elif i%2 == 1:
print(' '*(len(line)*2-i) + line[:i//2] + line[i//2] + line[i//2-1::-1])
else:
print(' '*(len(line)*2-i) + line[:i//2] + line[i//2-1::-1])
def main():
text = '赏花归去马如飞'
plalindrome(text)
if __name__ == '__main__':
main()
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line = "赏花归去马如飞"
for i in range(1,15):
if i%2 == 1:
print(line[:7-i//2],end = '')
print(line[:7-i//2][-1::-1])
else:
print(line[:7-int((i)/2)+1],end = '')
print(line[:7-int((i)/2)+1][-2::-1])
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