Linux， python 3 : syntax error on commandline but not in ipython %run command

Question

这个简单的代码在第 6 行的项目“`('”上产生了一个语法错误 当从命令行以 # ./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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除了在 ipython 中使用 %run 运行时，该图出现

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通过 %run 运行 ipython

问题:语法错误在哪里？

Answer 1

添加

!/usr/bin/env python

在 linux 中从命令行运行的 python 脚本的顶部