ValueError: invalid literal for int() with base 10: 7.8000000e+02

1. ValueError

Python int() 函数的输入字符串中可以包含数字字符和 +、- 符号，不能包含其它非数字字符。

number_string = "7.8000000e+02"

number_value = int(number_string)
1
2
3

/usr/bin/python2.7 /home/strong/PycharmProjects/crash_course/python_function/number_string.py
Traceback (most recent call last):
  File "/home/strong/PycharmProjects/crash_course/python_function/number_string.py", line 4, in <module>
    number_value = int(number_string)
ValueError: invalid literal for int() with base 10: '7.8000000e+02'

Process finished with exit code 1
1
2
3
4
5
6
7

2. Example 1

number_string = "7.8000000e+02"

float_value = float(number_string)

int_value1 = int(float_value)
int_value2 = int(float(number_string))

print("float_value: " + str(float_value))
print("int_value1: " + str(int_value1))
print("int_value2: " + str(int_value2))
1
2
3
4
5
6
7
8
9
10

/usr/bin/python2.7 /home/strong/PycharmProjects/crash_course/python_function/number_string.py
float_value: 780.0
int_value1: 780
int_value2: 780

Process finished with exit code 0
1
2
3
4
5
6

3. Example 2

number_string1 = "+99"
number_string2 = "-99"

int_value1 = int(number_string1)
int_value2 = int(number_string2)

print("int_value1: " + str(int_value1))
print("int_value2: " + str(int_value2))
1
2
3
4
5
6
7
8

/usr/bin/python2.7 /home/strong/PycharmProjects/crash_course/python_function/number_string.py
int_value1: 99
int_value2: -99

Process finished with exit code 0
1
2
3
4
5

References

[1] Yongqiang Cheng, https://yongqiang.blog.csdn.net/