用python打印三角形

以下是打印三角形的Python代码示例：

# 正向三角形
rows = 5
for i in range(1, rows+1):
for j in range(1, i+1):
print("*", end="")
print()

# 倒置三角形
rows = 5
for i in range(rows, 0, -1):
for j in range(0, i):
print("*", end="")
print()

# 等腰三角形
rows = 5
k = 2*rows - 2
for i in range(0, rows):
for j in range(0, k):
print(end=" ")
k = k - 1
for j in range(0, i+1):
print("*", end=" ")
print()