grid()函数概述
grid()函数用于设置绘图区网格线。
grid()的函数签名为matplotlib.pyplot.grid(b=None, which="major", axis="both", **kwargs)。
grid()的参数如下：
-
b：是否显示网格线。布尔值或None，可选参数。如果没有关键字参数，则b为True，如果b为None且没有关键字参数，相当于切换网格线的可见性。 -
which：网格线显示的尺度。字符串，可选参数，取值范围为{"major", "minor", "both"}，默认为"both"。"major"为主刻度、"minor"为次刻度。 -
axis：选择网格线显示的轴。字符串，可选参数，取值范围为{"both", "x", "y"}，默认为"both"`。 -
**kwargs：Line2D线条对象属性。
grid()的返回值为None。
grid()函数演示
import matplotlib.pyplot as plt
plt.subplot(341)
# grid()默认样式
plt.plot([1, 1])
plt.grid()
plt.annotate("grid()", (0, 1))
plt.subplot(342)
# 因为默认没有网格线，所以grid(None)显示网格线
plt.plot([1, 1])
plt.grid(None)
plt.annotate("grid(None)", (0, 1))
plt.subplot(343)
# 因为设置了网格线，所以grid(None)切换为不显示网格线
plt.plot([1, 1])
plt.grid(True)
plt.grid(None)
plt.annotate("grid(None)", (0, 1))
plt.subplot(344)
# 因为默认没有网格线
plt.plot([1, 1])
plt.annotate("default", (0, 1))
plt.subplot(345)
# 只显示主刻度网格线
plt.plot([1, 1])
plt.grid(which="major")
plt.annotate("which="major"", (0, 1))
plt.subplot(346)
# 只显示次刻度网格线，因为没有次刻度，所以无网格线
plt.plot([1, 1])
plt.grid(which="minor")
plt.annotate("which="minor"", (0, 1))
plt.subplot(347)
# 同时显示主刻度、次刻度网格线
plt.plot([1, 1])
plt.grid(which="both")
plt.annotate("which="both"", (0, 1))
plt.subplot(348)
plt.plot([1, 1])
# 默认同时显示主刻度、次刻度网格线
plt.grid()
plt.annotate("default", (0, 1))
plt.subplot(349)
# 只显示x轴网格线
plt.plot([1, 1])
plt.grid(axis="x")
plt.annotate("axis="x"", (0, 1))
plt.subplot(3,4,10)
# 只显示y轴网格线
plt.plot([1, 1])
plt.grid(axis="y")
plt.annotate("axis="y"", (0, 1))
plt.subplot(3,4,11)
# 同时显示xy轴网格线
plt.plot([1, 1])
plt.grid(axis="both")
plt.annotate("axis="both"", (0, 1))
plt.subplot(3,4,12)
# 默认显示xy轴网格线
plt.plot([1, 1])
plt.grid()
plt.annotate("default", (0, 1))
plt.show()
原理
pyplot.grid()其实调用的是gca().grid()，即Aexs.grid()。
底层相关函数有：
Axis.grid()
Axes.grid()源码（matplotlib/Axes/_base.py）
def grid(self, b=None, which="major", axis="both", **kwargs):
cbook._check_in_list(["x", "y", "both"], axis=axis)
if axis in ["x", "both"]:
self.xaxis.grid(b, which=which, **kwargs)
if axis in ["y", "both"]:
self.yaxis.grid(b, which=which, **kwargs)
xaxis 为XAxis类的实例，yaxis为YAxis类的实例，XAxis和YAxis类的基类为Axis。
Axis.grid()源码（matplotlib/axis.py）
def grid(self, b=None, which="major", **kwargs):
if b is not None:
if "visible" in kwargs and bool(b) != bool(kwargs["visible"]):
raise ValueError(
""b" and "visible" specify inconsistent grid visibilities")
if kwargs and not b: # something false-like but not None
cbook._warn_external("First parameter to grid() is false, "
"but line properties are supplied. The "
"grid will be enabled.")
b = True
which = which.lower()
cbook._check_in_list(["major", "minor", "both"], which=which)
gridkw = {"grid_" + item[0]: item[1] for item in kwargs.items()}
if "grid_visible" in gridkw:
forced_visibility = True
gridkw["gridOn"] = gridkw.pop("grid_visible")
else:
forced_visibility = False
if which in ["minor", "both"]:
if b is None and not forced_visibility:
gridkw["gridOn"] = not self._minor_tick_kw["gridOn"]
elif b is not None:
gridkw["gridOn"] = b
self.set_tick_params(which="minor", **gridkw)
if which in ["major", "both"]:
if b is None and not forced_visibility:
gridkw["gridOn"] = not self._major_tick_kw["gridOn"]
elif b is not None:
gridkw["gridOn"] = b
self.set_tick_params(which="major", **gridkw)
self.stale = True
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原文链接：https://blog.csdn.net/mighty13/article/details/113854397
