python 打印菱形、三角形、矩形

#打印实心等边三角形
print "打印空心等边三角形，这里去掉if-else条件判断就是实心的"
for i in range(0, rows + 1):#变量i控制行数
for j in range(0, rows – i):#(1,rows-i)
print " ",
j += 1
for k in range(0, 2 * i – 1):#(1,2*i)
if k == 0 or k == 2 * i – 2 or i == rows:
if i == rows:
if k % 2 == 0:#因为第一个数是从0开始的，所以要是偶数打印*，奇数打印空格
print "*",
else:
print " ", #注意这里的","，一定不能省略，可以起到不换行的作用
else:
print "*",
else:
print " ",
k += 1
print "\\n"
i += 1

#打印菱形
print "打印空心等菱形，这里去掉if-else条件判断就是实心的"
for i in range(rows):#变量i控制行数
for j in range(rows – i):#(1,rows-i)
print " ",
j += 1
for k in range(2 * i – 1):#(1,2*i)
if k == 0 or k == 2 * i – 2:
print "*",
else:
print " ",
k += 1
print "\\n"
i += 1
#菱形的下半部分
for i in range(rows):
for j in range(i):#(1,rows-i)
print " ",
j += 1
for k in range(2 * (rows – i) – 1):#(1,2*i)
if k == 0 or k == 2 * (rows – i) – 2:
print "*",
else:
print " ",
k += 1
print "\\n"
i += 1
#实心正方形
print "实心正方形"
for i in range(0, rows):
for k in range(0, rows):
print " * ", #注意这里的","，一定不能省略，可以起到不换行的作用
k += 1
i += 1
print "\\n"

#空心正方形
print "空心正方形"
for i in range(0, rows):
for k in range(0, rows):
if i != 0 and i != rows – 1:
if k == 0 or k == rows – 1:
#由于视觉效果看起来更像正方形，所以这里*两侧加了空格，增大距离
print " * ", #注意这里的","，一定不能省略，可以起到不换行的作用
else:
print " ", #该处有三个空格
else:
print " * ", #这里*两侧加了空格
k += 1
i += 1
print "\\n"