[Matplotlib-users] plotting points/locations from data file

[Michael R. <raw...@ya...>]

I'm trying to plot a series of points/locations on a map. I'm reading the latitudes and longitudes from a file, with each lat, lon pair on each record (line).  Here is the code:

def make_float(line):
    lati, longi = line.split()
    return float(lati), float(longi)

my_dict = {}
with open("file.txt") as f:
    for item in f:
        lati,longi = make_float(item)
        my_dict[lati] = longi

xpt,ypt = m(-76.1670,39.4670 )
plt.text(xpt,ypt,'1',color='white')

#print my_dict

The matplotlib code which I've previously used to plot a single point on the map is below, with longitude and latitude in ( ):

xpt,ypt = m(-70.758392,42.960445)
plt.text(xpt,ypt,'1',color='white')

When replacing (-70.758392,42.960445) with (longi,lati), the code plots only a single '1' at the location of just the last coordinate pair in the file. So now I only need to plot them all. Does the code I've implemented have an implicit loop to it? 

Mike