[Python] What the differences between these 3 for loops?

def generate_coor(dimension_x,dimension_y):
x,y=int(dimension_x/2),int(dimension_y/2)
for i in range(0, x + 1):
print(x)
x=x+1

generate_coor(100,27)


The above code does terminate.

def generate_coor(dimension_x,dimension_y):
x,y=int(dimension_x/2),int(dimension_y/2)
for i in range(0, x + 1):
for j in range(0, y + 1):
print(y)
y=y+1

generate_coor(100,27)


The above code does not terminate

def generate_coor(dimension_x,dimension_y):
x,y=int(dimension_x/2),int(dimension_y/2)
for i in range(0, y):
for j in range(0, y + 1):
print(y)
y=y+1


The above code does terminate

What the differences between these 3 examples? According to the code, each iteration for x or y should be increase by 1 hence the loop should not terminate but some terminate, some does not?

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