Why do I get ValueError: too many values ​​to unpack (expected 2) error when using pyecharts' Map? How to solve this problem?

The reason and solution of Pyecharts Map chart error: ValueError: too many values ​​to unpack (expected 2)

When drawing a map with Pyecharts, if you encounter ValueError: too many values to unpack (expected 2) error, it is usually because the data format does not match the expected of pyecharts.charts.Map .

Cause of error:

The add() method of pyecharts.charts.Map expects the data format to be a list, and each element in the list is a tuple containing two values: (place name, numeric value). The error message prompt "expected 2" indicates that your data tuple contains more than two values.

Error code example:

The following code throws the error:

 from pyecharts.charts import Map

map_chart = Map()
data = [
    ("Shanghai, 99"), # Error: A tuple containing a string, not (place name, value) ("Hubei, 56"), # Error: A tuple containing a string, not (place name, value)]
map_chart.add("test map", data, "china")
map_chart.render("map.html")

The problem is that the elements in the data list are single strings, not tuples containing place names and numeric values.

Solution:

Modify the data format to the correct tuple list:

 from pyecharts.charts import Map

map_chart = Map()
data = [
    ("Shanghai", 99), # Correct: Place names and values ​​are strings and integers respectively ("Hubei", 56), # Correct: Place names and values ​​are strings and integers respectively]
map_chart.add("test map", data, "china")
map_chart.render("map.html")

In the modified code, each element is a tuple containing two values. The first value is the region name of the string type, and the second value is the data of the numeric type. This way pyecharts can correctly parse the data and draw the map.

Summarize:

Make sure your data format is strictly in accordance with the tuple list structure of (地名, 数值) to avoid ValueError: too many values to unpack (expected 2) error. Note the data type, place names are usually strings, and values ​​can be integers or floating-point numbers.

The above is the detailed content of Why do I get ValueError: too many values ​​to unpack (expected 2) error when using pyecharts' Map? How to solve this problem?. For more information, please follow other related articles on the PHP Chinese website!