linux，python3：命令行中出现语法错误，但ipython％run命令中未出现

Question

此简单代码在第6行项目“`（'”上产生语法错误 从命令行以＃./main.py运行时

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import matplotlib.pyplot as plt
import numpy as np

# create a top-level Figure object
# with some optional customizations
fig = plt.figure('Population density',figsize=(5./2.254,5./2.254),facecolor='red',edgecolor='green')

# creating an Axes object containing axex and the rest
# we plot on the ax object of class Axes
ax = fig.add_subplot(111)

# we plot data with ax.plot

x = np.linspace(-2,2,1000)
line_cosh, = ax.plot(x, np.cosh(x))
line_quad, = ax.plot(x, 1+x**2/2)
plt.show()

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除非使用％run在ipython中运行，否则会出现图

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ipython通过％run

问题：语法错误在哪里？

Answer 1

添加

！/ usr / bin / env python

在Linux命令行中运行的python脚本之上